本篇介紹取自：http://www.patiencetaichi.com/public/109.cfm，有興趣的朋友可以參考。
The number of postures in different Tai Chi styles varies greatly. The original Tai Chi form consisted of 13 postures, based on the 8 trigrams and 5 elements. One of the most widely practiced styles of Tai Chi, Yang Style Long Form, uses a form with 108 postures and generally takes at least 20 minutes to complete.
