Kung Fu choreographer Woo-Ping Yuen initially refused to work on the film, and hoped that by asking for an exorbitant fee, it would turn off the Wachowskis. It didn't. He next formulated what he considered an impossible request. He said that he'd agree only if he had complete control of the fights, and that he trained the actors for four months before they shoot. The Wachowskis complied with his request.