Doing static leg exercises with your thigh muscles fully stretched might grow the upper part of your thigh more than doing regular leg exercises that move through a full range, but both types of exercise end up making your whole quadriceps muscle about the same size.

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.

If you train your quads using either holding a static position with your legs stretched out or doing full squat-like movements, both ways build your thigh muscles about the same amount — neither one is better than the other.

The lower part of your thigh doesn’t grow as much from weight training as the upper and middle parts—even if you train hard and use fancy techniques.

When you stretch your muscles fully during workouts, the ends of the muscles grow more than the middle parts — the stretch makes the muscle ends bulk up more than the center.

If you want to grow the outer part of your thigh (vastus lateralis), leg presses might be more effective than leg extensions.