I will introduce a traditional national sport Sumo. Sumo has been played since about fifteen hundred years. Children often had played Sumo as a play until fifty years ago, but they have rarely come to play sumo as a play nowadays. The rule is simple. A person whose body parts except for his soles touch the ground first or a person who goes out of sumo wrestling ring first is loser. Professional sumo wrestlers must do a traditional samurai hairstyle Chonmage and wear a sumo wrestler's loincloth. The professional sumo isn't played in being classified by weight, so there are matches between a very big sumo wrestler and a small sumo wrestler. If a small one wins a very big one, the spectators are excited. This is a match like that. Konishiki's weight is about 275kg and Mainoumi's weight is about 100kg. https://www.youtube.com/watch?v=RKPwvWKtHvc