Welcome to the  Ultraman World Championships, the greatest triathlon in the world! As many as 40 athletes endure an athletic odyssey of personal rediscovery; the next step in the endurance challenge of being human. Covering a total distance of 320 miles (515 kilometers) on the Big Island of Hawai’i, it requires that each participant complete a 6.2 mile (10 Km) open ocean swim, a 261.4 mile (421 K) bike ride, and a 52.4 mile (84 K) ultra-marathon run, the distances being determined by the size of the Big Island.