The reasons are as follows: 1: those who advocate the view of "true leg crutches" lack evidence. Excuse me, who is your teacher? You should tell everyone, Yang.

Taiji Biography and Physical Exercise Encyclopedia is the only important theoretical basis of "virtual leg rotation". This is the crystallization of the research and training of three generations of Yang family. Yang Chengfu said, "There is a school of Taiji. There is no other way. Don't show off yourself, be smart. " 2. Yang Chengfu's "Tai Ji Chuan's Complete Book for Physical Use" published on 1934 was also written with the help of his apprentice Zheng Manqing, and Zheng Manqing learned from his master the method of turning virtual legs into reality.

3. Yang Chengfu died in 1936. Before his death, his eldest son, Yang Zhenming, studied boxing with his father since childhood. He learned the truth and practiced boxing all his life. His posture is very similar to that of Yang Chengfu, and he has been teaching boxing with his father in the south. In his later years, Yang Chengpu taught boxing only orally and rarely demonstrated it. His eldest son Zhenming demonstrated boxing on behalf of his father. What needs to be clear is that Yang Zhenming instructed the basic footwork of virtual leg rotation. 4. Yang Zhenji, the second son of Yang Chengfu, studied boxing with his father and eldest brother Zhenming at the age of five, and his boxing frame was basically finalized. 1948, Yang Zhenji went to Guangzhou to find Yang Zhenming, the eldest brother who taught boxing, to unify the boxing frame. Later, he went to Zhongshan County to teach boxing on behalf of his eldest brother. Mr. Yang Zhenji said, "In my life, three people have been very kind to me in boxing matches. One is my father, who teaches me boxing; The second is Uncle Zhao Peng, who taught me to practice boxing. Third, eldest brother stayed in the middle, and he took me to learn boxing. " There is no doubt that Yang Zhenji's boxing is a real family heirloom. 5. From the lens analysis, Mr. Fu Zhongwen's boxing frame in his later years is also a "virtual leg turn". It's just that the center of gravity is slightly shifted, not a complete leg turn. 6. Analysis from the angle of attack and defense; Before the last step, the center of gravity moves backward, the front foot changes from real to virtual, and the rear leg changes from virtual to real, which is convenient for energy storage. This makes fiction and fact's transition light, labor-saving, smooth, and convenient for rational play. It is indisputable that one-handed stepping is the real "full-real" turn of the leg. 7. From the physiological point of view, virtual leg rotation greatly reduces the damage to the knee joint, while real leg rotation is a load-bearing job, which is more harmful to beginners.

Why are there no disputes between other sects? Only the Yang school is arguing endlessly, which is beyond the academic debate. I think there are three views at present, one is real leg turn, the other is virtual leg turn, and the third is big virtual turn and small virtual turn. I agree with the third one.