Some studies say doing arm exercises with shorter movements builds more muscle in the triceps, while others think full movements might help the biceps more—but we just don’t know for sure what’s best yet.

Doing a full squat or starting a bicep curl from the bottom makes your muscles grow more at the far ends (like the top of your thigh or the outer part of your bicep) than doing partial reps from the top.

Doing exercises through a full motion or starting the movement with a shorter motion (but not ending with it) helps your muscles grow more in your thighs and biceps than doing only the last part of the movement.

When you do full-range exercises like deep squats, some leg muscles like your inner thighs and butt grow more than others, but your front thigh muscles don’t seem to care whether you go deep or not — not all muscles react the same way to how far you move.