T'ai chi ch'uan, also called T'ai Chi or tai chi, was a type of martial art practiced for both its defense training and its health benefits. It was originally developed in China on Earth. The martial art form coup de vitesse borrowed a number of moves from T'ai Chi. (HH2) Tuttle worked as a tai chi instructor on the planet Meyerdahl in the 16th Century PD, teaching, among others, Stephanie Harrington and Maja Kerensky. (Tech Bu9)