The tail is drooping. When the tail hangs down, some people call it the "third leg". The important part of the body sinks to the ground through the tail, so that the knee is not stressed and does not hurt. Tai Ji Chuan, a national intangible cultural heritage, is based on the core ideas of Tai Chi and Dialectics of Yin and Yang in China's traditional Confucianism and Taoism, and integrates many functions such as temperament, physical fitness and fighting.