buttock
Lumbar vertebrae, thoracic vertebrae, scapular sternal joints and glenohumeral joints are interlocking joint dynamic chains. When your sole is in the posture of varus and valgus for a long time, it is impossible to keep all joints in the midline position, and the muscles covered by bones begin to be unbalanced, and the stability and activity function of the body will become worse and worse.
Related reading? Why do you want to do squats? First of all, it can promote the growth of whole body muscles.
Exercising the leg facing the sun can promote the se