Judo is a Japanese martial sport of throwing, mat holds, arm locks and chokes. Movements, mixture throws, counters, and ground grappling teach techniques. Judo's technological skills include applied physics and body leverage mechanics concepts to allow a smaller individual to defeat a bigger, larger opponent. American Judo-Hapkido Institute is affiliated with Shufu Yudansha-kai and U.S. Judo Federation. Students learn a very traditional Judo style, including shiai (contest preparation) and kata (formal skills). The American Judo-Hapkido Institute produced several national and international champions.