Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Yang family style tai chi chuan in its many variations is the most popular and widely practised style in the world today and the second in terms of seniority among the primary five family styles of tai chi chuan. Grandmaster Yang Zhen Duo is from the fourth generation of the Yang family and is officially the Fourth Lineage Holder of the Traditional Yang Style Tai Chi Chuan. He was born in Beijing in 1926 and is the third son of Yang Ch''eng-fu. He started studying with his father when very young and continued studying with his elder brothers after his father died. In 1960 Yang Zhen Duo moved to Taiyuan, Shanxi Province. Since then, Yang style tai chi chuan has gradually spread within Taiyuan and to other cities, provinces, and countries.