1. First, check whether the movements in high-wall training are standardized. When squatting against the wall, the angle of the knee can be appropriately increased and decreased on the basis of a right angle. But be careful, and feel your heels fall back.

2. Then in the high-wall training, you can change a pair of shoes with good anti-slip performance, or use anti-slip mats and yoga mats.

3. Finally, in high-wall training, there is another possibility that the strength of legs and knees is weak, and the angle of knees can be larger.