Every diagram, in one place.
2984+ ready-made animated diagrams across 17 subjects. Search, filter, click, embed. Now in every major language. It’s free (forever).
The Daily Cortisol Curve
A 24-hour cortisol rhythm with a configurable stress spike and threshold band - clean, animated, and instantly legible.
Bell Curve with “You Are Here”
The canonical normal distribution with a personal percentile marker that scrolls into place as the reader arrives.
Compound vs Linear Returns
Two curves over 30 years - the compounding investor pulling away from the linear saver, with milestone markers.
Sankey Flow
A two-stage flow visualizing how a population splits across categories - the data-viz workhorse.
AMPK Activation Pathway
Berberine through Complex I to AMPK signaling and downstream fat oxidation.
Mitochondrial Biogenesis
PGC-1α activation and the formation of new mitochondria over a training timeline.
Sleep Architecture Hypnogram
Full-night hypnogram across five stages (W/N1/N2/N3/REM): deep sleep front-loaded, REM expands toward morning, GH pulse in first N3.
Autophagy
Damaged organelle recognition, isolation, and lysosomal degradation.
Growth Hormone Cascade
The 45-minute exercise mark, GH surge, and downstream fat mobilization.
Motor Unit Recruitment
Size principle, threshold activation, force grading across Type I → IIx.
Heart Rate Zones
Z1-Z5 zones with metabolic substrate dominance and training adaptations.
Progressive Overload
Linear training stress over weeks with deload markers and supercompensation.
Caffeine & Fat Mobilization
Adrenal stimulation, cAMP cascade, HSL activation, FFA release.
Creatine & ATP Regeneration
The phosphocreatine shuttle and rapid ATP resynthesis during max effort.
Omega-3 & Inflammation Resolution
Resolvin and protectin synthesis from EPA/DHA via COX/LOX modulation.
Magnesium & Sleep
GABA receptor activation and downstream sleep-onset effects.
Donut Chart
Animated arc-fill donut with center label - the workhorse composition chart.
Bar Comparison
Side-by-side animated bars with optional confidence intervals.
Dot Matrix (X of Y)
”8 out of 10 patients…” rendered as a 100-dot grid that fills in.
Waterfall Chart
Start → deltas → end. The breakdown chart that shows where value moves.
Three-Circle Venn
Animated overlapping pulses with central intersection highlight.
Multi-Protocol Radar
A spider chart with up to 5 protocols overlaid on N labeled axes.
Risk vs Return Frontier
A scatter of portfolios with the efficient frontier highlighted.
Inflation’s Bite Over Decades
Purchasing power decay at configurable inflation rates.
Civil Case Lifecycle
Filing → discovery → trial → appeal, with average duration markers.
US Federal Court Hierarchy
District → Circuit → SCOTUS with case-flow arrows.
Burden of Proof Comparison
Preponderance vs clear-and-convincing vs beyond-reasonable-doubt.
TCP Three-Way Handshake
SYN → SYN-ACK → ACK with timing marks and packet labels.
Gradient Descent
A loss surface with the parameter ball rolling toward a minimum.
Transformer Attention Flow
Tokens attending to one another with weighted edges, animated.
The Carbon Cycle
Atmosphere ↔ ocean ↔ biosphere ↔ lithosphere flows with annual fluxes.
Energy Mix by Country
Animated stacked bars comparing fuel-source share by country.
SIR Epidemic Curves
Susceptible / Infected / Recovered curves with R₀ controllable.
Drug Half-Life Decay
Plasma concentration falling exponentially with dose markers.
Sales Funnel
TOFU → MOFU → BOFU with drop-off rates animated at each stage.
AARRR Pirate Metrics
Acquisition → Activation → Retention → Referral → Revenue.
Yerkes-Dodson Curve
Performance vs arousal - the inverted-U with task-difficulty overlays.
Dunning-Kruger Curve
Confidence-by-experience curve, with Mt. Stupid clearly labeled.
mTOR Activation Pathway
Three upstream signals (leucine, mechanical tension, insulin) converge on mTORC1 at the lysosome, phosphorylating S6K1 and 4E-BP1 to unlock myofibrillar protein synthesis.
Muscle Protein Synthesis Curve
MPS spikes after a training stimulus, peaks around 24 hours, returns to baseline by 48-72 hours.
The Leucine Threshold
Below ~2.5g leucine, MPS barely budges. Above it, the response is near-maximal.
Mechanical Tension and Length-Tension Curve
End-range isometric holds produce maximum hypertrophy signal by combining active and passive force at long muscle lengths.
Loaded Stretch: Sarcomere Mechanics and Satellite Cell Activation
A muscle fiber held under load at full stretch activates titin mechanosensors, satellite cells, and mTORC1 through the phosphatidic acid pathway, explaining why end-range loading outperforms mid-range.
Metabolic Stress Mechanism
High-rep sets drive H+ and lactate accumulation → cell swelling → growth-factor release as a secondary hypertrophy pathway.
Junk Volume vs Effective Volume
30 sets/week where the last 8 add recovery cost but no MPS benefit — 22 all-effective sets beats 30 diluted.
Partial vs Full ROM Hypertrophy
Lengthened-bias partials outperform full ROM by ~25%; shortened partials underperform. Titin passive force explains the advantage.
Muscle Protein Balance
MPS vs MPB over 48h post-workout — the net positive area between the curves equals muscle gain.
Proximity to Failure and Hypertrophy
RIR 0–1 produces maximum hypertrophy stimulus; RIR 2–3 is nearly as effective; RIR 4+ significantly underdoses the muscle.
Metabolic Stress & The Pump
Lactate, H+ accumulation, and cell swelling as a secondary hypertrophy driver.
Volume Dose-Response
Hypertrophy gains rise with weekly sets, plateau, and eventually decline (the inverted U).
Frequency vs Total Volume
Same weekly volume split across 1, 2, or 3 sessions per muscle - similar growth, different recovery.
RIR / RPE Scale
A visual ladder from RPE 6 (easy) to RPE 10 (failure) with growth-relevance bands.
Time Under Tension
Total tension time per set across rep ranges, with the productive 30-70 second band highlighted.
Hypertrophy Across Rep Ranges
Growth comparable from 5-30 reps when sets are taken close to failure.
Routes to Progressive Overload
Add load, add reps, add sets, reduce rest, slow tempo, improve range. Six valid paths.
Minimum Effective Dose
The smallest weekly volume that still drives growth - typically 4-6 hard sets per muscle per week.
Maintenance Volume
You can hold gains on as little as 1-3 hard sets per muscle per week during deloads or busy phases.
Fatigue and Recovery Curve
Performance dips after a hard session, returns and surpasses baseline (supercompensation).
Supercompensation Cycle
A single training stimulus drives a performance dip (fatigue), a return to baseline (recovery), and a transient overshoot (+20-40% above baseline) before returning to normal without re-stimulation.
The Novice Effect
Year 1 training produces nearly half of all gains achievable in 5 years. Returns diminish sharply with training age.
Genetic Ceiling
Drug-free muscular potential plotted against years of training - approaches an asymptote.
Fiber Type Distribution
Type I (slow) vs Type IIa/IIx (fast) by muscle group: postural muscles are slower, prime movers faster.
Satellite Cell Activation
Damaged fibers recruit quiescent Pax7+ satellite cells; they activate, proliferate, and fuse with the fiber, donating new myonuclei that sustain protein synthesis and support hypertrophy.
Sarcoplasmic vs Myofibrillar Hypertrophy
High-rep pump training expands the sarcoplasm (fluid, glycogen, organelles) while heavy training densifies myofibrils. Same size gain, very different strength-per-unit-size outcomes.
Muscle Memory
Myonuclei retained from prior training make regaining lost muscle dramatically faster.
Mind-Muscle Connection
Internal focus during a rep increases activation of the target muscle by 5-20% in trained lifters.
Training to Failure: When It Matters
Failure on isolation work can drive growth; failure on heavy compounds is mostly fatigue.
Eccentric Emphasis
Slow eccentrics drive disproportionate damage and tension - a high-cost, high-reward technique.
Stretch-Mediated Hypertrophy
Loading a muscle in its lengthened position drives more growth than mid-range or short.
Hypertrophy vs Strength Adaptations
Strength gains come from neural drive plus muscle mass; the ratio shifts as training progresses.
Androgen Receptor Density
Hard training upregulates androgen receptor density in trained muscles - more receptors mean more anabolic signal capture.
Alcohol and Muscle Protein Synthesis
After alcohol: mTOR switches off, MPS falls 37%, testosterone drops, deep sleep is disrupted. Normal recovery vs post-alcohol shown side by side.
Androgen Receptor Binding: Baseline vs Optimized
Training increases AR density 110-130%; L-carnitine adds 15-20% more. More receptors mean testosterone binds instead of missing. Lock and key mechanism shown.
Training-Induced Androgen Receptor Upregulation
Untrained muscle has 3 baseline AR. After consistent training, 5 additional receptors appear, raising total density to capture more testosterone with each pulse.
Training Age Gains Curves
Year 1: 20-25 lbs. Year 2: 10-12. Year 3: 5-7. Year 5+: 1-3. Drug-free male average.
Three Mechanisms of Hypertrophy
Mechanical tension, metabolic stress, muscle damage - three pathways, one outcome.
Volume Landmarks (MV / MEV / MAV / MRV)
Maintenance, minimum effective, maximum adaptive, maximum recoverable - the four volume bands.
Muscle Fiber Recruitment Ladder
Three fiber types recruit in order as effort intensity rises, with recruitment thresholds marked.
Compound Returns Curve
Consistent small improvements compound dramatically over time - shown against a linear baseline.
Protocol Comparison Radar
Multi-axis radar comparing fitness protocols across fat loss, muscle preservation, sustainability, hunger, cost, and simplicity.
Myonuclear Domain Theory
Each myonucleus governs a finite cytoplasmic territory. When a fiber outgrows its nuclei, satellite cells must donate new ones to sustain growth.
Myostatin Inhibition
Myostatin signals via ActRIIB and Smad2/3 to suppress muscle growth. Follistatin, resistance training, and genetic loss-of-function all release this brake.
Androgen Receptor Density: Training vs Baseline
Resistance training raises AR density 110-130% over 16 weeks; LCLT adds 15-22% further. More receptors capture more testosterone from the same circulating pulse.
Force-Velocity Curve
Maximum force a muscle can produce drops as contraction speed rises - the inverse relationship that defines training zones.
1RM Percentage Chart
Reps achievable at each percentage of one-rep max, from 100% (1 rep) to 60% (~20 reps).
Neural Drive in Strength Gains
Most early strength gain comes from the nervous system, not new muscle - rate coding, recruitment, and synchronization.
Rate of Force Development
How fast you can produce force - the slope of the early force-time curve, critical for sport.
Henneman Size Principle
Motor units recruit smallest first, largest last - load determines who joins the lift.
Velocity-Based Training Zones
Bar speed predicts load and fatigue - autoregulate strength sessions by m/s.
Progressive Overload for Strength
Linear, double-progression, percentage-waved: three classic strength loading patterns.
Squat, Bench, Deadlift Loading
Typical week of percentage loading across the three big lifts in a strength block.
Powerlifting Meet Day Flow
Opener, second, third - how to pick attempts to hit a personal best without bombing.
Westside Max-Effort Method
Weekly ME days: upper and lower, working up to a daily 1–3RM with rotating exercise selection.
Westside Dynamic-Effort Method
Speed work at 50–60% 1RM moved as fast as possible: 8–12 sets of 1–3 reps with 45–60s rest.
Max-Effort Method
Working up to a daily 1-3RM single - Westside-style intensification.
Dynamic-Effort Method
Submaximal loads moved as fast as possible to train rate of force development.
Compound vs Isolation for Strength
Compounds build whole-body strength; isolations patch weak links and prevent imbalances.
Tendon Stiffness Adaptation
Heavy slow lifts increase tendon stiffness, improving force transfer and joint integrity.
Isometric Strength Curve
Strength is joint-angle specific - isometrics train the angle held, with a small carry-over band.
Overcoming vs Yielding Isometrics
Push against immovable load (overcoming) vs hold a load in place (yielding) - different adaptations.
Cluster Sets
Break a set into mini-clusters with 15–30s intra-set rest — total reps preserved at higher velocity and intensity.
Post-Activation Potentiation
A heavy conditioning set primes the nervous system — subsequent explosive efforts perform 2–5% better inside the PAP window.
Progressive Overload Routes
Five variables to drive adaptation — manipulate one at a time per mesocycle.
Cluster Sets: Loading Comparison
Break a set into mini-sets with 10-30s rest - more high-quality reps at heavy loads.
Wave Loading
Ascending sets in waves: 5/3/1, 5/3/1 - heavier each wave by exploiting PAP.
Post-Activation Potentiation (alt)
A heavy lift primes the nervous system - subsequent explosive efforts perform better.
Beginner vs Advanced Loading
Novices add weight every session; intermediates weekly; advanced lifters by training cycle.
Specificity (SAID Principle)
You get strong at exactly what you practice - load, range, speed, position.
Strength Detraining Curve
Strength holds for 1-3 weeks off, then declines slowly - faster than hypertrophy fades.
Female Strength Adaptation
Women gain relative strength at similar rates to men, with smaller absolute hypertrophy.
Tendon RFD Development
Rate-of-force-development curve over 200 ms: trained lifters produce 80% of peak force by 80 ms; untrained need 160 ms.
Neural Adaptations to Strength Training
Motor unit recruitment, rate coding, and synchronization drive most early strength gains. Hypertrophy contribution grows slowly over months.
Neuromuscular Junction
Motor neuron releases ACh into the synaptic cleft; binding to nAChR triggers Na+ influx, end-plate potential, and muscle action potential.
Body Fat % and Ab Visibility
Animated walk through 4 body-fat ranges (20%+, 15%, 10%, 6-7%) with the subcutaneous fat layer thinning, ab definition emerging, V-cut appearing at low BF, and a hormonal-cost zone highlighted at competition stage.
Contest Prep Timeline
A 16-week cut from offseason weight to stage condition, with calorie, cardio, and physique milestones.
Peak Week Protocol
Water, sodium, carbs, and training across the final 7 days for stage-day fullness.
Symmetry, Proportion, Balance
The three judging axes: left-right symmetry, classical proportions, no weak body parts.
Offseason Mass-Building Phase
Lean bulk math: small surplus, weekly weight gain target, when to cut back into prep.
P-Ratio (Partition of Surplus)
Body fat % strongly determines whether a calorie surplus goes to muscle or fat.
Mini-Cut / Bulk Cycles
Short 4-week cuts woven into a long bulk to keep body fat in check.
Weak-Point Bringing-Up
Extra frequency, extra volume, and earlier-in-session priority for lagging body parts.
Glycogen Loading Mechanism
Depletion plus rebound carb load fills muscles 1.5-2x normal glycogen for fuller stage look.
Water and Sodium Manipulation
High water and sodium normalize aldosterone, then a small drop reveals dryness without flatness.
Posing Energy Cost
Mandatory poses are a serious workout - hours of practice burn meaningful calories late prep.
Physique Division Targets
Bodybuilding, classic, mens-physique, womens-physique, bikini, wellness - what each judges for.
Classical Proportions
Steve-Reeves shoulder-waist ratios, calf-arm-neck equality, the golden-age aesthetic.
Natural vs Enhanced Trajectories
Lean-mass ceilings, recovery rate, and physique potential differ markedly between groups.
Aggressive vs Conservative Cuts
Aggressive 25%+ deficits cut faster but sacrifice more muscle; conservative 10-15% deficits preserve.
Compound + Isolation Stack
Compounds for systemic stimulus, isolations for sculpting - bodybuilding splits combine both.
Bodybuilding Splits Compared
Bro split, push-pull-legs, upper-lower, full-body - frequency vs volume tradeoffs.
Training Density
Work per unit time - drop sets, supersets, rest-pause - density-as-intensification.
Cell Swelling and the Pump
Intracellular fluid surge during high-rep work signals growth via mechanosensors.
Anabolic Hormone Environment
Testosterone, GH, IGF-1, insulin - their training-driven and meal-driven curves.
Natural Physique Ceiling (FFMI)
Drug-free FFMI distribution: average 22, drug-free elite ~25, beyond suggests enhancement.
Post-Show Rebound
Hormones recover, glycogen refills, water normalizes - 1-2 week structured rebound.
Eras of Physique
Reeves, Schwarzenegger, mass monsters, classic-physique revival - shifting aesthetic targets.
Reverse Dieting
Slow calorie ramp post-cut to recover metabolism without rapid fat regain.
Pre-Contest Cardio Strategy
LISS volume rising into late prep, HIIT held early, fasted vs fed timing.
Natural Physique History
FFMI 24–25.5 has been the drug-free elite ceiling from Sandow through Reeves to modern tested naturals — consistent across 120 years.
Lipolysis Cascade
Catecholamines bind beta-receptors, activate HSL via cAMP/PKA, and free fatty acids leave the adipocyte.
Energy Balance Equation
Calories in vs out, with TDEE broken into BMR, NEAT, EAT, TEF - all four shift on a cut.
Metabolic Adaptation Curve
TDEE drops faster than weight predicts during a cut - adaptive thermogenesis is real but bounded.
Deficit Size vs Outcome
Aggressive deficits cut fat fast but lose more muscle and stall sooner.
Stubborn Fat Receptor Density Map
Body silhouette with heatmap overlays shows stubborn fat zones alongside a receptor pathway comparison: alpha-2 blocks lipolysis while beta-3 enables it.
Fat Oxidation by Intensity
Fat-burn rate peaks around 60-65% VO2max - the "fat-burning zone" is real but small.
Leptin Decline on a Cut
Leptin drops fast in a deficit, dragging satiety, NEAT, and thyroid down with it.
Leptin and Ghrelin Cycle
Leptin falls 24-72h into deficit while ghrelin rises; refeed partially restores leptin.
Ghrelin Hunger Pattern
Ghrelin spikes before habitual meal times - hunger is partly trained.
Refeed Mechanism
1-2 high-carb days restore leptin, glycogen, and training output without ruining a cut.
Diet Break vs Continuous Cut
A 1-2 week break at maintenance partially restores metabolism and improves long-term adherence.
Protein Targets on a Cut
1-1.2g per lb of bodyweight protects muscle through a deficit.
Cardio vs Diet Deficit
Same kcal deficit, different costs - food cuts spare time, cardio spares hunger.
LISS vs HIIT for Fat Loss
LISS burns more fat per session but takes longer; HIIT spikes EPOC but adds fatigue.
EPOC: The Afterburn
Excess oxygen consumption after intense work modestly raises post-session calorie burn.
Fat Loss Rate Targets
Lean lifters: 0.5% bodyweight/week. Heavier: 1%/week. Faster than that bleeds muscle.
Plateau Troubleshooting Tree
Step-by-step decision flow through tracking accuracy, NEAT drift, water retention, and true metabolic adaptation before cutting further.
The Whoosh Effect
Fat cells retain water as triglycerides leave, masking true fat loss on the scale until water drains abruptly.
Three-Phase Fat Loss Model
Rapid mobilization gives way to adaptive slowdown and then stubborn fat as a cut progresses.
Unilateral Loading and Regional Fat Mobilization
The loaded limb shows 60-180% greater ipsilateral adipose blood flow and FFA release during exercise.
Set Point and Settling Point
The body defends a fat-mass range; environment shifts the settling point within it.
Sleep and Fat Loss
Short sleep tilts cut losses toward muscle - same deficit, worse outcome.
Alcohol and Fat Oxidation
Alcohol is metabolized preferentially; fat oxidation pauses, acetaldehyde accumulates, and cortisol and estrogen rise as downstream consequences.
Fat Cell Number vs Size
Adults shed mostly cell volume, not number - permanent obesity changes the floor.
Body Recomposition
Lose fat and gain muscle simultaneously - possible only for novices, returnees, and overfat lifters.
Hunger vs Appetite
Physiological hunger is hormonal; appetite is psychological. They diverge on a cut and demand different interventions.
Visceral vs Subcutaneous Fat
Visceral fat is metabolically dangerous; subcutaneous is largely cosmetic.
Fasting Effects on Fat Loss
IF doesn't out-burn equivalent calorie diets - the win is adherence and meal-pattern simplicity.
Minimum Healthy Body Fat
Essential fat: 3-5% men, 8-12% women. Below that, hormones and immunity suffer.
Body Recomposition Split Bar
Fat lost vs muscle gained during a recomposition phase shown as a bidirectional bar from center.
Body Fat Distribution Heatmap
A silhouette heatmap showing where stubborn fat accumulates by density, colored from blue (low) to orange (high).
Visceral Fat Risk Gauge
A semicircular gauge needle showing visceral fat risk level from low to high.
Blood Flow Rebound Mechanism
Isometric compression squeezes out blood and catecholamines; the reactive hyperemia on release floods stubborn fat depots with lipolytic signals during the 2-3 minute HIIT window.
Regional Fat Loss Rotation
Beta-3 dominant depots (arms, chest, thighs) respond first; alpha-2 dominant depots (lower belly, hips) lose fat last, explaining the sequential pattern across a cut.
Poor Adipose Blood Flow in Visceral Fat
Visceral fat has sparse capillary networks and poor perfusion, trapping FFAs after lipolysis and driving re-esterification instead of oxidation.
Diet Break Mechanism
Alternating deficit and maintenance phases prevent metabolic adaptation, sustaining fat loss rate over a 16-week programme.
Fat: Path of Least Resistance
Beta-3 dominant depots (arms, chest) lose fat first; alpha-2 dominant depots (lower belly, hips) lose last.
Five Fat Loss Pillars
Nutrition, training, sleep, supplements, and cold exposure each attack fat cells through a distinct molecular pathway.
Unilateral Loading Core Asymmetry
Single-sided kettlebell loading forces 30-50% MVC anti-rotation and anti-lateral core demand during cycles 1-4, eliminating the need for a dedicated core slot.
Dark Side of Aggressive Fat Loss
A deficit that is too deep or too prolonged triggers T3 suppression, leptin crash, hunger upregulation, and muscle catabolism that all compound each other.
Five Pillars of Body Recomposition
Training stimulus, protein, energy balance, sleep, and recovery are the five independent variables that together determine body composition outcome.
Alcohol Impact on Muscle Protein Synthesis
Ethanol blunts mTORC1 activity and suppresses myofibrillar protein synthesis by 20-37% in a dose-dependent pattern that persists for hours after drinking.
Cardio vs Diet: Matched 500 kcal Deficit
Same calorie gap, different downstream effects. Cardio preserves metabolic rate and muscle; diet wins on adherence. Combining both outperforms either strategy alone.
Set Point Theory and Fat Loss
The body defends a weight range via adaptive thermogenesis, cutting RMR by up to 14% beyond lean-mass losses. Plateaus are biology, not willpower failure.
VO2max Curve
The ceiling of aerobic capacity - the most-trained metric in endurance sport.
Lactate Threshold
Two breakpoints (LT1, LT2) split aerobic, threshold, and red-line zones.
Heart Rate Zones
Zone 1-5 mapped to %HRmax, lactate, fuel mix, and training purpose.
Polarized Training Distribution
80% easy, 20% hard, almost nothing in the middle - the elite endurance pattern.
Three Energy Systems
Phosphocreatine (10s), glycolytic (90s), oxidative (hours) - which system dominates by duration.
Fat vs Carb Fuel Mix
Higher intensity tilts fuel mix toward carbohydrate; lower toward fat.
Cardiac Output Adaptation
Endurance training raises stroke volume and lowers resting HR - same output, less work.
Mitochondrial Density Adaptation
Endurance training doubles or triples mitochondria per fiber over months.
Capillary Density Adaptation
Endurance training expands the capillary network around each muscle fiber.
HIIT Protocols Compared
Tabata, 4x4, 30/30, sprint intervals - intensity, work-rest, target adaptations.
Maffetone Aerobic Method
180 minus age as a max heart rate cap - long, slow base-building.
Glycogen Depletion in Endurance
Muscle and liver glycogen drain in parallel - the wall hits when both bottom out.
Cardiac Drift
HR rises during long steady efforts even at fixed pace - dehydration and fatigue.
Running Economy
Oxygen cost per mile at a given pace - lower is faster for the same VO2max.
Critical Power
The hyperbolic power-duration curve and W-prime - the modern endurance model.
Endurance Periodization
Base, build, peak, taper - 16-week endurance season structure.
Taper Effect
A 10-21 day taper recovers freshness while preserving fitness - 1-3% performance gain.
Altitude Training Adaptations
EPO rises within days, hemoglobin and red cells over weeks - sea-level performance gains.
Heat Acclimatization
10-14 days of heat exposure boosts plasma volume, sweat rate, and performance even in cool conditions.
Overtraining in Endurance
HRV drops, resting HR drifts up, mood and performance fall - the OTS pattern.
In-Race Fueling Strategy
60-90g/h carbs for events over 2 hours - mixed glucose+fructose unlocks higher intake.
Gut Training
Practice fueling at high rates in training - the gut adapts to carry more without distress.
Mobility vs Flexibility
Flexibility is passive ROM; mobility is active control through that ROM. Different qualities, different training.
Static, Dynamic, PNF, Loaded
Four stretching modalities, each with different acute and chronic effects.
PNF Stretching Mechanism
Contract-relax cycles use Golgi tendon reflexes to deepen ROM beyond static stretching.
End-Range Control
Strong, controlled positions at the end of joint range protect against injury.
Loaded Stretching
Stretching under load builds both length and strength in the lengthened position.
Reciprocal Inhibition
Contracting an agonist relaxes its antagonist, a stretching shortcut to deeper ROM.
Fascial Considerations
Fascia is plastic but slow: sustained low-load tension reshapes it over weeks while brief high-tension holds only inhibit the nervous system.
Hip Mobility Map
Six axes of hip ROM: flexion, extension, abduction, adduction, internal, external rotation.
Shoulder Mobility Map
Flexion, abduction, ER, IR plus scapular control - the shoulder needs all five.
Thoracic Spine Mobility
T-spine extension and rotation deficits cause downstream low-back and shoulder issues.
Ankle Dorsiflexion
Limited dorsiflexion changes squat mechanics, knee tracking, and foot strike.
Hypermobility Spectrum
Some lifters have too much range - stability work matters more than stretching.
Pre-Lift Mobility Routine
Dynamic, position-specific drills for the lifts ahead - not generic static stretching.
Static Stretching Power Loss
Long static holds before a max effort cut force output by 5-10% for 30+ minutes.
CARs (Controlled Articular Rotations)
Active circles through max joint range build end-range control and joint health.
Joint-by-Joint Mobility Needs
Each joint alternates between primary stability or primary mobility needs up the chain.
Fascial Plasticity
Connective tissue remodels from a random cross-link network to an aligned elastic network under repeated mechanical loading.
Mobility-Stability Continuum (Joint by Joint)
Ankle, hip, thoracic, and glenohumeral joints demand mobility; knee, lumbar, and scapular joints demand stability.
Motor Compensation Patterns
When a restricted joint cannot move, the adjacent joint is forced to compensate, amplifying injury risk at the compensating site.
Tendon Healing Curve
Tendons heal in three phases over 12+ weeks: inflammatory, proliferative, remodeling.
Tendinopathy Progression
Reactive, dysrepair, degenerative - the continuum that needs different loading at each stage.
Return-to-Play Criteria
Pain, strength, functional tests, sport-specific demands - five gates before returning.
Common Running Injuries Map
Where runners hurt: knee, shin, foot, hip - prevalence and primary causes.
Isometrics for Tendinopathy
Heavy isometric holds reduce tendon pain immediately and tolerate higher loads safely.
Eccentric Loading Protocols
Slow eccentrics (Alfredson) remodel collagen and reduce tendon pain over 12 weeks.
Heavy Slow Resistance
Heavy 6-rep sets with 6-second tempos rival eccentrics with less time per session.
Rehab Load Progression
Pain-monitoring traffic light: green (under 3/10), yellow (settles overnight), red (over 5).
Acute:Chronic Workload Ratio
Sudden load spikes (ACWR > 1.5) sharply raise injury risk.
Rotator Cuff Rehab Progression
Pain-free isometrics, then external rotation, then overhead - a 12-week return.
Low Back Pain Flow
Most cases improve with movement, not bedrest. Flexion vs extension preference guides which direction to load first.
ACL Return Timeline
9-12 months minimum. Re-injury risk is 4.5x in the first months post-reconstruction and only falls to near-baseline after criteria-based clearance at 9 months.
Concussion Recovery Stages
Symptom-limited rest, light cardio, sport-specific, contact, return - the graduated 6-step protocol.
Strength Asymmetry Thresholds
Side-to-side strength gaps over 10-15% predict re-injury and reduced performance.
Pre-Hab Screening
FMS, hop tests, single-leg balance - identify weak links before they become injuries.
Inflammation Resolution
Acute inflammation is the start of healing - blunting it with ice/NSAIDs may slow it.
DOMS vs Real Injury
Soreness 24-72h post-training is normal; sharp, persistent, or worsening pain is not.
Injury Prevention Pyramid
Sleep, sensible loading, basic strength - simple foundations beat fancy modalities.
Collagen Remodeling: Before and After Protocol
Sparse disorganized collagen (before) vs dense aligned matrix (after collagen peptides + Vit C + mechanical loading). 10-15% of muscle mass is connective tissue.
Connective Tissue Adaptation
Muscle adapts in weeks; tendons take months. The gap creates the injury risk zone. Fibroblast collagen remodeling and patience as protection.
Motor Unit Recruitment
Slow units fire first; fast units join only as load or fatigue rises.
Type I vs IIa vs IIx Fibers
Three fiber subtypes with different sizes, fatigue rates, mitochondria, and trainability.
Central vs Peripheral Fatigue
Fatigue comes from CNS drive falling, peripheral failure of contraction, and metabolic disruption.
Supercompensation Cycle
Stimulus, fatigue, recovery, overshoot - the textbook adaptation curve.
RIR Detection Accuracy
Trained lifters underestimate RIR by 1-2 reps; novices by 4+.
Training to Failure (the science)
Failure adds fatigue faster than it adds growth, and the cost-benefit shifts by exercise type.
Recovery Time by System
CNS, muscle, tendon, glycogen - each recovers on its own clock.
Functional Overreach vs Overtraining
A planned dip improves long-term gain; a chronic dip is overtraining syndrome.
Session RPE x Duration Load
Session RPE multiplied by session duration is a simple internal-load proxy.
TUT vs RIR Tradeoff
Higher TUT can substitute for lower RIR (closer-to-failure) and vice versa.
Mechanotransduction
Mechanical force converts to biochemical signal at the cell membrane and z-line.
Amino Acid Pool
Free amino pool sits between intake, breakdown, and protein synthesis, small but vital.
ATP Production by Duration
PCr seconds, glycolysis seconds-to-minutes, oxidative minutes-to-hours.
Lactate Shuttle
Lactate is fuel, not waste - shuttled from fast fibers to slow fibers and the heart.
Hill Force-Velocity Equation
The classic hyperbolic equation linking muscle force and shortening velocity.
Length-Tension Relationship
Force a sarcomere produces depends on overlap of actin and myosin filaments.
Acute Hormonal Response
Cortisol, GH, testosterone, epinephrine all spike during training - magnitude depends on intensity and volume.
CNS Fatigue Recovery
Heavy near-1RM lifts deplete CNS for 24-72h; high-rep work is mostly local.
Concurrent Training Interference
Lots of cardio plus lifting can blunt strength/hypertrophy - dose, timing, and modality matter.
AMPK vs mTOR Crosstalk
AMPK (energy stress) and mTOR (anabolic) inhibit each other - the cardio-vs-strength signal switch.
Training Load Monitoring Tools
HRV, jump height, grip strength, mood - low-burden daily readiness markers.
Training Effect Sizes
Volume, intensity, frequency - which variable contributes most to growth, and by how much.
Sleep, Stress, Recovery
Cortisol from life stress competes with training stress in the same recovery budget.
Individual Response Variability
Identical programs produce 2x to 3x different outcomes between people, genetics matter.
Muscle Tone vs Hypertrophy
Tone is resting neural activation; hypertrophy is fiber cross-section. They change independently and require different training strategies.
Overtraining Catabolic Cascade
When training load accumulates faster than recovery allows, cortisol rises chronically above testosterone and the hormonal environment turns catabolic.
Fatigue and Recovery Curve
Training stimulus causes performance dip through fatigue, then recovery overshoots in supercompensation before detraining returns it to baseline.
Muscle Fiber Type Comparison
Type I (slow oxidative), IIa (fast oxidative-glycolytic), and IIx (fast glycolytic) compared across six physiological traits.
Lever Length Progression
Tucked, advanced tuck, straddle, full - each stage extends the lever arm and multiplies torque demand on the target musculature.
Isometric and End-Range Strength
Calisthenics progressions from brute-force holds to effortless positions through irradiation, end-range conditioning, and neural efficiency.
Lever Length Progression (Animated)
Interactive push-up lever progression from knee (50% body weight) through standard (65%) to decline and planche lean (85%), with fulcrum mechanics and torque formula.
Motor Unit Recruitment (Animated)
Interactive diagram of Type I, IIa, and IIx motor unit recruitment as load increases, with neural adaptation state showing rate coding and reduced co-contraction.
Loaded Stretch for Hypertrophy
Training muscles in the lengthened position with load adds sarcomeres in series, produces superior hypertrophy in recent trials, and works via a distinct mechanism from peak-contraction training.
Muscle Tone Mechanism
Resting muscle tone is maintained by basal motor unit firing rate and intrinsic viscoelastic stiffness, not by persistent contraction or the degree of hypertrophy.
Myofibrillar Protein Synthesis
Leucine triggers mTORC1, initiating 24-48 hours of elevated myofibrillar protein synthesis after resistance training that builds contractile tissue.
Sarcoplasmic vs Myofibrillar Hypertrophy
Sarcoplasmic hypertrophy is expansion of the cytoplasm (glycogen, water, enzymes) without more contractile protein; myofibrillar hypertrophy adds actual actin and myosin sarcomeres.
Supercompensation Curve
A training stress disrupts homeostasis, recovery restores capacity, and supercompensation temporarily overshoots baseline before decaying back if not reinforced.
Androgen Receptor Binding
Testosterone and DHT bind the androgen receptor, trigger dimerization and nuclear translocation, and drive transcription of muscle growth, bone density, and red blood cell genes.
Linear Periodization
Volume drops, intensity rises across weeks - the classical strength model.
Daily Undulating Periodization
Rep ranges and intensities rotate within a week - hypertrophy Mon, strength Wed, power Fri.
Block Periodization
Concentrated blocks: accumulation, intensification, realization - sequential focus.
Conjugate Method (Westside)
Max-effort and dynamic-effort days, repetition method, rotating exercise variations weekly.
Macro / Meso / Micro Cycles
Year, month, week - nested cycles that organize a training plan.
Volume-Intensity Tradeoff
You can push one or the other, not both - the periodization fundamental.
Deload Week Mechanism
Cut volume 40-60% for a week to bank recovery and reset readiness.
MEV to MAV to MRV Progression
Start a meso at MEV, add sets weekly toward MRV, then deload.
Specificity Curve Through a Cycle
Early phases use general means; late phases use sport-specific means.
Taper Strategies Compared
Linear, exponential, step - same volume cut, different shapes.
Peaking for a Powerlifting Meet
Volume drops weeks out, intensity nudges up, then a sharp taper - peak day-of.
Concurrent Training Model
Strength and endurance trained together - manage interference with timing and dose.
Autoregulation Flow
Adjust load, volume, or even session by daily readiness rather than fixed prescription.
Beginner Linear Progression
Add weight every session - the simplest, most effective novice program.
Intermediate Weekly Progression
Weekly add to a working set or top single - the next step after linear stalls.
Advanced Block Progression
Cycles measured in months, not weeks - small gains require longer arcs.
Training Residuals
Each adaptation lasts a different time after training stops - aerobic 30+d, max-strength 30d, sprint 5d.
Banister Fitness-Fatigue Model
Performance = fitness minus fatigue - both shift with each session, but on different timescales.
Menstrual Cycle and Training Adaptation
Estrogen and progesterone fluctuations across 28 days shape recovery, performance, and fueling.
Female Strength Adaptation
Relative strength gains track male trajectories; absolute load and lean mass differ by hormone profile.
Female Hypertrophy Response
Same growth rate per unit volume; lower starting muscle mass; high tolerance for volume.
Pregnancy Training by Trimester
What changes each trimester: position restrictions, intensity targets, weight progression.
Follicular Phase Training
Low-to-rising estrogen days favor heavier loading and harder sessions.
Luteal Phase Training
Higher progesterone, higher core temp, more fatigue - moderate loads, prioritize recovery.
PMS Symptoms and Training
Cramps, mood swings, water retention - common patterns and how to train through them.
Perimenopause Training Adaptations
Estrogen decline shifts recovery, body composition, and bone density: lift heavier, prioritize protein.
Post-Menopausal Training
Heavy strength, plyometrics, and protein protect bone, muscle, and metabolism after 50.
Bone Density Across the Female Lifespan
Bone peaks ~28, plateaus, drops sharply at menopause. Training during youth banks a larger buffer.
Female Fat Distribution
Estrogen patterns fat to hips and thighs (gynoid) until menopause shifts it abdominal.
Pelvic Floor Training
The often-ignored core component - integrated breath, bracing, and Kegel mechanics.
Postpartum Return to Training
6-week clearance, gradual core/pelvic floor rebuild, then progressive loading - 6-12 month arc.
Diastasis Recti
Linea alba separation common in pregnancy: close it with breath and core retraining, not crunches.
Running Gait Cycle
Stance, swing, flight - the four phases of a running stride and where injuries arise.
Powerlifting Meet Prep Block
12 weeks of accumulation, intensification, peak, taper for a powerlifting meet.
Cycling Power Zones
Coggan's seven zones from active recovery to neuromuscular - based on FTP.
Freestyle Stroke Mechanics
Catch, pull, recovery - phases of the freestyle stroke and where speed comes from.
Cadence and Stride Length
Speed = cadence x stride length. Recreational runners gain most from raising cadence, not stride.
Running Form and Economy
Posture, foot strike, ground contact time - small form changes shift VO2 cost meaningfully.
Running Shoe Drop and Stack
Heel-toe drop and stack height shift load between calf and knee.
Olympic Lift Phases
First pull, transition, second pull, turnover, catch - the snatch and clean phases.
Sprint Mechanics
Drive phase, transition, max-velocity - what changes in posture and force across 100m.
Stretch-Shortening Cycle
Eccentric pre-stretch stores elastic energy, brief amortization, then explosive concentric.
Vertical Jump Power Curve
Force-time profile of a vertical jump, from countermovement through takeoff.
Soccer Match Energy Demands
90 minutes mostly aerobic but punctuated with anaerobic sprints - dual-system athlete.
Basketball Game Demands
Repeated short sprints with brief recoveries plus jumping volume - the alactic-aerobic mix.
Tennis Match Physiology
5-15s points with 25-30s rests - alactic system dominant, aerobic for recovery between points.
Combat Sport Conditioning
High-intensity rounds with short rests - alactic capacity, lactate tolerance, and aerobic base.
Climbing Finger Strength
Crimp, half-crimp, open hand - grip positions, max forces, and tendon load profiles.
CrossFit WOD Demands
Mixed-modal AMRAP and EMOM tasks - a glycolytic system stress test.
Sport-Specific Aerobic Base
Even sprint and power sports benefit from an aerobic base for recovery between efforts.
FTP Test Protocols
20-min test, ramp test, 8-min - how each estimates functional threshold power.
Swim Pacing Strategy
Even-split, positive-split, or negative-split - pacing patterns for distance swims.
Swim Breath Patterns
Bilateral, hypoxic, ipsilateral - breath timing affects technique and CO2 tolerance.
Triathlon Transitions
T1 (swim-bike) and T2 (bike-run) - small physiological shifts that hurt rhythm.
Sport Energy Demands Comparison
4-sport quadrant chart: soccer, basketball, tennis, MMA — work:rest ratio, intensity, and energy system mix.
Beginner Newbie Gains Window
Year 1 of training is the highest-return year you will ever have - gains compound rapidly.
Beginner Full-Body Template
3 days a week, 5-6 compounds, linear progression - the highest-return novice template.
Squat / Bench / Deadlift Form Checklist
The 5-7 cues per lift that prevent the bulk of beginner injuries.
Progressive Overload Basics
Add a rep, add a weight, add a set - simple progression rules for novices.
Beginner Warmup Routine
5 min cardio, 5 min mobility, 3-4 ramp-up sets - the bare-minimum effective warmup.
Rest Time Targets
1-2 min for isolations, 2-3 min for compounds, 3-5 min for heavy compounds.
Stall Troubleshooting
Sleep, food, recovery, technique - check these before adding training complexity.
Beginner Protein Target
0.7-1.0 g per lb bodyweight - the simple rule that covers nearly all needs.
Beginner Recovery Basics
7-9h sleep, days off between sessions, basic stress hygiene - 80% of recovery in three habits.
Beginner Volume Targets
8-12 weekly sets per muscle is plenty for new lifters - more isn't better yet.
Beginner Injury Prevention
Slow load, master form first, listen to pain - the three rules that prevent most novice injuries.
Beginner Cardio Basics
2-3 sessions per week of zone 2, 20-40 min - foundation cardio without sapping recovery.
Beginner Progress Markers
Strength PRs, body comp photos, sleep quality, mood - what to track besides scale weight.
Equipment Priority Pyramid
Barbell + plates first, then squat rack, then bench, then accessories - what actually matters.
Beginner Mistakes
Program hopping, ego loading, skipping legs, undereating, too much cardio - the common traps.
Beginner Frequency Basics
2-3x per muscle per week beats 1x at the same total volume.
Normal Distribution
The classic bell curve with shaded sigma bands and a configurable percentile callout.
Standard Normal (z-score)
Mean 0, SD 1. Translate any raw score to a z and read its percentile.
Log-normal Distribution
Right-skewed distribution where log(X) is normal. Income, asset prices, file sizes.
Poisson Distribution
Counts of rare events in a fixed window. Lambda controls both mean and variance.
Exponential Distribution
Time-between-events for a memoryless process. Rate parameter lambda.
Uniform Distribution
Equal density between a and b, zero outside. The maximum-entropy bounded distribution.
Student's t Distribution
Bell-shaped but with fatter tails than normal. The reference for small-sample t-tests.
Chi-squared Distribution
Right-skewed distribution of summed squared standard normals. Tests of variance and fit.
Beta Distribution
Flexible distribution on [0,1]. The Bayesian conjugate for binomial proportions.
Gamma Distribution
Generalization of exponential with shape and rate parameters. Wait-time for k events.
Binomial Distribution
Number of successes in n independent Bernoulli trials at probability p.
Mixture of Gaussians
Two or three overlapping bell curves summed into a multi-modal distribution.
Pareto Distribution
The 80/20 power-law. Heavy right tail dominates the mean.
CDF vs PDF
Density and cumulative shown side-by-side. Area under the PDF equals height of the CDF.
"You Are Here" Bell Curve
A normal distribution with a position marker and flag label showing where a specific value falls in the distribution.
P-Value Interpretation
Standard normal with critical zones shaded and a myth-busting callout: p < 0.05 is not the probability the effect is real.
Effect Size: Cohen's d
Three side-by-side distribution pairs showing small (0.2), medium (0.5), and large (0.8) Cohen d with overlap percentages.
95% Confidence Interval
Sampling distribution with CI band, plus a repeated-sampling panel showing 15 CIs with one miss.
Type I vs Type II Error
2x2 truth table of reality vs decision, with alpha, beta, power, and tradeoff callout.
Statistical Power Analysis
Power vs sample size curves for three effect sizes, with 80% threshold and N* marker.
Sample Size Calculation
Four-ingredient breakdown of the n formula plus a lookup table for d x power combinations.
Publication Bias Mechanism
Flow from 100 studies to biased meta-analysis: 30 positive published, 65 negatives in file drawer.
Vertical Bar Chart
Categorical comparison with a single value per category. The workhorse.
Horizontal Bar Chart
Long category names read better on the Y-axis. Useful for rankings.
Grouped Bar Chart
Two or three series side-by-side per category. Compares groups across categories.
Diverging Bar Chart
Bars that extend left or right of zero. Shows positive and negative deltas.
100% Stacked Column
Columns of equal height showing percentage breakdowns per category.
Radar (Spider) Chart
Multi-dimensional comparison plotted on radial axes. One closed polygon per entity.
Lollipop Chart
A bar chart trimmed to a thin stem with a circle on top. Less ink, same comparison.
Dot Strip Plot
A row of dots per category showing the distribution of individual observations.
Dot Density Matrix
A 10x10 grid of dots illustrating "X out of 100" risk or proportion.
Slope Chart
Two points per category connected by a line. Direct visual of before-vs-after change.
Dumbbell Chart
Two dots per category connected by a bar. Compares pairs across many categories.
Bullet Chart
Compact metric display: actual vs target vs qualitative ranges.
Small Multiples (Bar Grid)
A 2x3 grid of mini bar charts, one per facet. Same scale, easy comparison.
Ranking Bump Chart
Lines tracking rank position over time periods. Crossings show ranking shifts.
Pareto Chart
Sorted bars with a cumulative percentage line overlay. The 80/20 visualization.
Box Plot Comparison
Side-by-side box-and-whisker plots showing distribution differences across groups.
Horizontal Bar Ranking
Ranked horizontal bars with count-up value animation. Default data: protein quality DIAAS scores.
Comparison Grid
An items-by-metrics grid with bar fills and color-coded values per cell. Shows which method leads on each dimension.
Two-Sample t-Test
Two overlapping distributions with means marked, t-statistic callout, and p-value verdict.
Chi-Square Test
Observed vs expected frequency table with paired bar chart and chi-square statistic callout.
One-Way ANOVA
Three group distributions on the left, F-distribution with rejection region on the right.
Sankey (Two Stage)
Sources on the left flow into destinations on the right. Width encodes volume.
Sankey (Three Stage)
Three-column flow with intermediate routing. Captures pipelines and processes.
Funnel Chart
Shrinking horizontal bands from a wide top stage to a narrow bottom outcome.
Waterfall (Financial Bridge)
Starting balance plus and minus contributions land at an ending balance.
Alluvial Flow Diagram
Categorical data flowing across multiple time periods or steps. Tracks group membership.
Tornado (Sensitivity) Chart
Variables ranked by impact on an outcome. Bars extend left/right of a central baseline.
Parallel Sets
Categorical multivariate visualization with axes for each dimension.
Pipeline Stages
Linear horizontal pipeline with counts at each gate. Pipeline-style flow.
Cycle / Loop Flow
Circular arrow path showing a closed cycle of stages.
Directed Process Flow
A flowchart of decision diamonds, process boxes, and connecting arrows.
Gantt Pipeline
Horizontal bars laid out over a time axis showing parallel and sequential phases.
Mass Balance Cascade
100% input splits into branches at each step. Rejected and retained portions tracked.
Arc Flow Diagram
Arcs above a horizontal axis connecting source-target pairs. Arc thickness encodes flow.
Paired Cascade Comparison
Two funnels side-by-side comparing conversion across two scenarios.
Scatter Plot
Points plotted on X-Y axes showing the relationship between two numeric variables.
Scatter with Regression Line
Dots plus an OLS line of best fit. Optional confidence band.
Bubble Chart
Scatter plot with a third variable encoded as bubble size.
Connected Scatter
Scatter dots connected by a path showing trajectory through the X-Y plane over time.
Correlation Matrix Heatmap
NxN grid of pairwise correlations colored from -1 to +1.
Correlation Spectrum
A ladder of seven scatter plots from r=-1 through 0 to +1.
Residual Plot
Residuals on Y vs fitted on X. Diagnoses linearity and heteroscedasticity.
Q-Q Plot
Sample quantiles vs theoretical quantiles. Tests distributional assumptions.
Force-Directed Network
Nodes and edges arranged by simulated forces. Reveals clusters and hubs.
Chord Diagram
Circular layout with arcs around the perimeter and chords between groups inside.
Hex-bin Density
Hexagonal bins covering a scatter plot. Color encodes point density.
Two-Set Venn
Two overlapping circles. Region areas convey set sizes and intersection.
Parallel Coordinates
Multivariate observations as polylines crossing parallel vertical axes.
Scatterplot Matrix (SPM)
NxN grid of pairwise scatter plots. The visual analog of a correlation matrix.
Three-Set Venn Diagram
Three overlapping circles (Diet, Sleep, Training) with a pulsing center glow where all three intersect.
Causes Network (Radial Spoke)
A central outcome node surrounded by six cause nodes connected by curved spokes with scale-in animation.
Regression Coefficient (beta)
Scatter plot with line of best fit, annotated slope triangle showing 1-unit X change = beta Y change.
Odds Ratio (OR)
2x2 contingency table with cell formulas, OR calculation, and comparison bar.
Risk Ratio vs Odds Ratio
Side-by-side comparison of RR and OR from the same vaccine trial data, with when-to-use guidance.
Kaplan-Meier Survival Curve
Step-down survival curves for two treatment arms, censored tick marks, and log-rank p-value.
Meta-Analysis Funnel Plot
Effect size vs standard error scatter with asymmetric funnel showing publication bias.
Donut Chart
Pie chart with the center cut out, leaving room for a headline number.
Pie Chart
Classic full pie. Use only with 3-5 well-differentiated slices.
Gauge / Percent Ring
A 270-degree arc filling to a percentage. Single-metric KPI display.
100% Stacked Bar (Single)
A single full-width bar segmented to show composition shares.
Stacked Bar (Multi-Category)
Multiple stacked bars, one per category, with absolute counts.
Treemap (Flat)
Nested rectangles whose areas encode value. Single-level partition.
Treemap (Hierarchical)
Nested treemap with 2-level hierarchy (groups containing items).
Marimekko (Mosaic) Chart
Two-variable mosaic. Column widths encode one variable, segment heights the other.
Sunburst
Radial hierarchy: center root, rings outward for sub-levels.
Icicle Chart
Hierarchical composition shown as nested horizontal bands top-down.
Circle Packing
Nested circles whose areas encode value. Children packed inside parent.