Sumo is Japan's national sport. A sumo tournament called "Honbasho (Main match)" is held six times a year. One of these events is held in Tokyo every September. The matches on the dohyo ring are very impressive. The sound of the Sumo wrestlers' bodies colliding echoes throughout the hall. The rules of sumo are very simple: the person who steps outside the circle or whose part other than their feet touches the floor loses. Although the rules are simple, there are 82 techniques. Please pay attention to the techniques that are performed by their well-trained bodies.