If you're already fit, doing bicep and tricep exercises through a shorter range of motion—but pushing to your max—can build muscle just as well as doing full reps.

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.

Lifting weights through a shorter movement range can build muscle just as well as lifting through a full movement range — no difference in muscle growth.

Going all the way to muscle exhaustion during one set of strength training might give you a tiny bit more muscle growth in your arms and legs than stopping two reps early — but the difference is small and not always clear.

Doing certain leg exercises that only go partway through the motion—but stretch the calf muscle while lifting—might build bigger calf muscles than doing the full movement or shorter movements.

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.