 Sun learned Wu (Hao)-style t'ai chi ch'uan from Hao Wei-chen.Sun started studying with Hao relatively late in his life, but his accomplishments in the other two internal arts led him to develop his t'ai chi abilities to a high standard more quickly than is usual.He subsequently was invited by Yang Shao-hou, Yang Chengfu and Wu Chien-ch'üan to join them on the faculty of the Beijing Physical Education Research Institute where they taught t'ai chi to the public after 1914.