At 89, many rely on glasses or hearing aids. Wu Bin needs neither. Daily runs and regular football games keep the legendary martial arts coach of action icon Jet Li in fighting form. Wu is a convincing advertisement for the wellness benefits of lifelong discipline. He still travels widely and recently presided over the 18th Hong Kong International Wushu Competition, where Dragon He, the son of another of Wu’s former students, Jaden He Jingde, was competing. A founder of the Beijing Wushu Team,...