The triathlon is a sporting event that consists of swimming, cycling, and running. The distances swam, biked, and run vary based on the age limit or quality of the competition. A full triathlon consists of a 2.4 mile (3.8 Km) swim, a 112 mile (180 Km) bike ride, and a marathon run. Triathlons for children can be as short as a 100 meter swim, a 5 Km bike race, and a 1 Km run.