Was Xu, Xuan-Ping's 37 improved in 800 AD supported on the 13 Postures from Qianzai 100 years befor? It is more likely that these bare-bones same-fortify movements were practiced widely, or perhaps originally in Hubei office, and credit for united them with Taiji theory can not be attribute to one weak person. "Taiji Chang Quan" live in many variations, and yet develop into Taijiquan. Other shapeliness of the same time such as "Heavenly-Inborn Style", "Nine Small Heavens", and "Acquired Kung Fu" also show similarities to what later became Taijiquan. The principles of softness, sticking, adhering, and second-hand the opposite's own momentum against himself were established in these precursory martial styles. Bodhidharma's teaching at the Buddhist Shaolin Temple, which circumstantial the hypothesis, speculation of worn the mind to lead the Qi to energize the corporeal body, is fare considered the origin of the Internal Martial Arts.

https://richsupplementtalk.com/ancient-origin-yin-yang-review/