Moving your muscles through their full stretch and contraction makes them grow more than only doing part of the movement, especially at the stretched end.

Even if you don’t move through the full range, doing the exercise where your muscle is stretched the most (like halfway down in a squat) builds more muscle than doing it where the muscle is bunched up (like a shallow squat).

Doing calf exercises with a deeper stretch at the start might help your calf muscles grow bigger than doing them with a shorter stretch, because the stretched position could put more tension on the muscle.

Doing weightlifting exercises by only moving the weight through the longest part of the stretch actually builds more calf muscle than lifting through the full range or only the shortened part.

Doing only the bottom part of an exercise (where the muscle is stretched) can build as much muscle in your arms and legs as doing the full movement, as long as you put in the same amount of effort and work.

When people lift weights through a full motion vs. just part of the motion, the muscles might look like they grow more in one case—but that could just be because the weight feels heavier at different points, not because the muscle is stretched more. So we can’t be sure if stretching the muscle is what’s causing the growth.