The Cheng Man-ch'ing and Chinese Sports Commission short forms are said to be derived from Yang family forms, but neither is recognized as Yang family t'ai chi ch'uan by current Yang
family teachers. The Chen, Yang and Wu families are now promoting their own shortened demonstration forms for competitive purposes.
Yang Chengfu also developed his own shortened version of the Yang Long Form in order to have it easier to teach to modern students who are busy with modern life. Despite being
shortened, Yang Chengfu managed to keep the essentials of the Yang Long form.