Hong Kong action cinema
The directors had long been admirers of Hong Kong action cinema, so they decided to hire the Chinese martial arts choreographer and film director Yuen Woo-ping to work on fight scenes. To prepare for the wire fu, the actors had to train hard for several months. The Wachowskis first scheduled four months for training, beginning in October 1997. Yuen was optimistic but then began to worry when he realized how unfit the actors were.