Chen style Tai Chi places special emphasis on loosening the waist and moving the crotch on the walking frame, twisting the waist and buckling the crotch, and collapsing the waist and rounding the crotch. The first is to relax the waist and crotch. The second one is that the waist is tight and you use force. Usually turned around and driven. Crotch buttoning is almost a crotch position, which has the function of protecting the crotch. The third step on the waist means that the center of gravity of the waist is lowered, and the round crotch feels like an O-shaped leg. To be precise, the hips should be separated as much as possible and the knees should be slightly buckled.