Judo is an Olympic sport since 1964 and is a martial art that originated in Japan. It involves grappling techniques such as throws, holds, and joint locks. LUGE is another Olympic sport since 1964 and is a winter sport where a person rides a small sled down a frozen track. Jud is a three-letter Olympic sport since 1964 and is a form of sailing where competitors race on small boats called dinghies.