Yao Zongxun was very able, well educated man, and at the same time he was a great warrior, who had chance to fight in many challenges, with many masters of various styles and in fights with street gangs (in the time of chaos in late 1940s). Although in 1950s and 1960s among his students there were many with great talent, the situation didn't allow frequent combat-oriented training. His sons had more chance for this kind of practice though. When in 1979 Yao family came back to Beijing, teaching yiquan(Yi Chuan) as a martial art openly became possible. But those students who learned before Cultural Revolution were too old for this kind of intensive combat oriented training. So Yao Zongxun had chosen his sons and a few other young students to participate in this combat training. From those few, Yao Chengguang, Yao Chengrong and Cui Ruibin are most famous for their combative skills. Master Yao Chengguang, as elder of the twin brothers, is regarded as successor of his father.
Yao Chengguang started teaching yiquan(Yi Chuan) about 1980, propagating it in various parts of China. In Beijing he taught at Beijing University of Chinese Medicine and Pharmacology, Beijing University, Beijing Industrial University. He conducted many fights, proving his skill. In 1982 he took part in one of the first of san da tournaments. But after the first fight, when he knocked his opponent out unconscious in first round, he was forbidden participating in san da tournaments, because his explosive power was too dangerous. Later he had been teaching in Hong Kong and Japan, in all places conducting many victorious fights. In 1994 the school Zongxun Wuguan (Zongxun is Yao Chengguang's father's name, wuguan means martial arts school) was founded. Yao Chengguang became it's director and chief instructor. Presently master Yao Chengguang is also president of Beijing Yiquan(Yi Chuan) Research Association. In 2001 he was giving seminars in Italy.