In the esoteric art of Hsing-I for example, it is often said that the whole style is dependent on developing and understanding Hsing l's signature san ti stance. It corresponds to the head, hands and feet in boxing. The Dan Shu says that Tao generates chi from emptiness. This chi generates yin and yang. Yin and yang become trinity.
Trinity creates everything.
The so-called 'chi in emptiness' is the root of heaven and earth, the source of yin and yang, and the origin of everything. Clearly the relationships between stance training, the cultivation of chi and the ultimate mastery of a style is deep and profound. And doubtless a better understanding of a style's underlying metaphysics and philosophies will improve our skill. But fortunately, such a deep understanding is not a prerequisite to significant benefits from stance training. As Ch'ang Dung Sheng often said, success comes from doing.