As in all sports, Judo has a strict set of rules that governs competition and ensures safety. For those who want to test their skills, Judo offers the opportunity for competition at all skill levels, from club to national tournaments, to the Olympic Games. There are separate weight divisions for men and women, and boys and girls. Judo is best known for its spectacular throwing techniques but also involves considerable grappling on the ground utilizing specialized pins, control holds, arm locks, and Judo choking techniques. Judo emphasizes safety and full physical activity for top conditioning. Judo is learned on special mats for comfort and safety.