If you are a martial arts fan you must have watched the epic movie starring Rain called Ninja Assassin. Something I didn’t know, was that Rain had to go through a whole lot of training in order to do the martial arts scenes and learn the fight choreography. I always thought he was a trained martial artist, that’s how good and smooth his fight scenes are! Check out the video below that shows some of his training leading up to shooting the film. Rain is a South Korean singer-songwriter, actor, and music producer.