No one has studied whether doing exercises with a full or limited range of motion makes your core muscles grow bigger, so we don’t know the best way to train them for muscle growth.

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.

Doing partial-range weight exercises with a longer muscle stretch can build arm and thigh muscles just as well as doing full-range exercises, as long as you’ve been training for a while and do it for 12 weeks.

If you're already strength-trained and do upper-body workouts for 8 weeks, it doesn't matter much if you lift all the way up and down or just do part of the motion—your muscles grow and get stronger about the same either way.

This study didn't check how hard you work out, how close you get to max effort, or which exercises you pick — so we can't say for sure how those things affect muscle growth or strength.

If you're already someone who lifts weights, doing either static holds with your muscles stretched out or full-range weight exercises won't make the outer part of your thigh noticeably bigger in just six weeks.