Why full-body works for novices
A three day full-body template built around five or six compound lifts gives each major muscle group several exposures per week while keeping the total session count low. This frequency suits beginners because the early gains come largely from neural adaptation and learning the lifts, both of which improve with regular practice.
Compound movements such as squats, presses, rows, and hinges recruit large amounts of muscle per set, so a short list of exercises can cover the whole body efficiently.
How linear progression fits in
Linear progression means adding a small amount of weight or reps each session while form holds. New trainees can recover fast enough to improve workout to workout, which is why this simple model produces strong returns before more elaborate periodization becomes necessary.
Progress eventually slows and the template needs adjusting, which is normal rather than a failure. Loads and rates of increase should be scaled to the individual. This is general educational information and not a substitute for coaching or medical guidance.