Doing full squats or full arm movements when lifting weights doesn’t necessarily make your thigh muscles grow bigger than doing partial movements—studies show both ways work about the same, so going all the way down or all the way up might not give you extra muscle gains.

If you lift weights through a full movement range—like squatting all the way down and up—you’ll build bigger leg muscles than if you only half-squat, especially if you’re new to lifting and male.

If older people who didn’t get stronger from doing just one set of weight exercises start doing four sets instead, their thigh muscles will grow bigger — and this was measured with a detailed scan.

Even doing a huge number of leg sets—over 50 a week—didn’t make anyone’s muscles shrink, which means there might be a very high limit to how much training your muscles can handle without losing size.

When guys who never lifted weights before started doing leg workouts for 15 weeks, their thigh muscles got 12.7% bigger—and super-precise MRI scans proved it, showing this tech is great for tracking 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.