If new guys lift weights for 15 weeks using full movements, their leg muscles get longer and stronger at the fiber level compared to doing shorter movements—even if they spend the same amount of time lifting.

If new guys lift weights for 15 weeks using only part of the movement—focusing on the shorter muscle position—they build more muscle size in that specific area and get stronger at certain joint angles, according to this claim.

If you're new to lifting weights, how far you move during each rep — like doing full squats vs. half squats — changes how your muscles adapt, even if you spend the same total time lifting.

If you're a guy who lifts weights, going all the way to failure or stopping just short gives your muscles about the same kind of growth changes over 10 weeks.

Not all muscles grow the same way when you move through different ranges—some might need bigger movements than others. So, telling everyone to do the same type of lift might not work for every muscle.

Lifting weights twice a week for six weeks — whether using heavier or lighter weights — helps young, healthy guys build leg muscle just about the same amount, compared to not training at all.