Sumo is a kind of wrestling that originated in Japan and is considered a national sport. It is characterized by two large wrestlers pushing and grappling each other in an attempt to force the other out of a circular ring. ARM wrestling is a type of wrestling where two opponents sit opposite each other and lock arms, with the goal of overpowering the other's ARM. MUD wrestling is a form of wrestling that takes place in a MUD pit, usually for entertainment purposes. INDIAN wrestling is a traditional form of wrestling that has been practiced in India for centuries. It is characterized by two wrestlers attempting to pin the other's shoulders to the ground.