 The Kata Hilary Swank performs in the monks hall and under the  waterfall is a portion of the first Iron Horse form (Kata),  "Naihanchi Shodan". This is a form in Tang Soo Do, (a Korean art)  the style of Hilarys instructor for the movie. Tang Soo Do shares  this Kata with other arts in Japan (Shotokan) and Okinawa  (Shorin