If I asked, “Give me 5 things that you think symbolizes Japan.” what would you say? I guarantee that most people will include Sumo as one of the five. And why not? It’s very unique to have big overweight men in fundoshi (the funny little underwear they wear) and gelled chonmage (a samuri buns) wrestling each other in a little ring isn’t it? So don’t wait any longer! Go out there and see it for yourself! Rules As an ex-wrestler myself, I can tell you that the rules of sumo wrestling are significantly different and also a lot simpler than freestyle wrestling. First, sumo wrestling has absolutely no weight classes.