Master Don Ahn studied Tai Chi Chuan with the late Professor Cheng, Man Ching. Master Ahn also studied briefly with the Master Yang, Shao Zhong, eldest son of Yang, Cheng Fu (Professor Cheng's Teacher) in Hong Kong. Master Ahn is one of the rare Tai Chi teachers who mastered rooting power and opened his Tan Tien. 12 people can't uproot and push him.