Sit on the bench in class, stand on tiptoe and jump up and down with your legs. Can you stovepipe?
Think too much, that's the performance of muscle tension and shaking legs. Although it is considered to exercise leg muscles, the intensity is too small. Might as well walk.
Be thin and muscular. This is the healthiest way to exercise. Keep running and you will lose your legs ~ just 3-5 laps a day. It's about persistence Since girls care so much about beauty, I believe I can persist in running ~ ~