1. Pull the ligament and sit on the ground or bed, not a spring bed, but a flat one, preferably a trampoline. Straighten one leg, hook the foot surface, and push the heel as far as possible. The other bend, put it on the knee of the straight leg, touch the foot of the straight leg with your hand, insist ... and then change to the other leg. ....

2. Lying in bed, driving your legs to the wall, your legs and torso are at 90 degrees, which is exhausting.

3. Learn more from girls when you have time and walk on tiptoe.