Watch Secrets of the Yangtze Collection: Writing Kung Fu / Kung Fu vs. Yoga (1970) : Full Movie Online Free Get a double dose of high-octane martial arts action with this pair of kung fu classics. First, only a teacher (John Cheung) is willing to go head-to-head with brutal martial arts master Ah Yen (Bolo Yeung, who also directs), who comes to town and wreaks havoc in Writing Kung Fu. Then, kung fu champion Yuet Sang Chin and yoga master Singh (Dupar Singh) butt heads in Kung Fu vs. Yoga, directed by Chuan Chen.