The principle behind progressive overload
Progressive overload is the gradual increase of stress placed on the body during training so that it continues to adapt. Without an increasing demand, the body has no reason to add strength or muscle, which is why repeating the same workout indefinitely leads to a plateau. The increase can come through several variables, not weight alone.
Common levers are adding load, adding reps at a given weight, adding a set, improving range of motion or control, or reducing rest between sets. Manipulating any of these raises the total training stimulus over time.
Simple progression rules for novices
Beginners often progress fastest with linear progression: add a small amount of weight or an extra rep whenever the prescribed reps are completed with good form. A typical scheme might be to add the smallest available increment to a lift each session or week until progress stalls.
Progress should be gradual to manage fatigue and reduce injury risk. When linear gains stall, trainees usually shift to slower or more structured progression and may include planned lighter periods (deloads) to recover.