There is a simple and effective method about ligament, but it feels good. Although it looks like a form of forced cheating, it is relatively easy for forced cheating.

1. Sit facing the wall.

2. Keep your legs apart and lean against the wall as much as possible (remember that your feet must be straight).

3. Support your back with your hands. In order to fix the body, move back, and it will have no effect. )

4. Spread your legs slowly at your own pace.

I have seen such people in the dance training center!