A triathlon is a multi-disciplinary endurance event that consists of three continuous and sequential races, usually swimming, cycling, and running. However, there are various synonyms for the word triathlon, depending on the specific sports involved, such as aquathlon, duathlon, and decathlon. Aquathlon is a swim-run race, while duathlon combines running and cycling, and decathlon involves ten different track and field events. Other synonyms include ultraman, which is a long-distance triathlon, and ironman, which is a specific brand of a triathlon that involves 2.4 miles of swimming, 112 miles of cycling, and 26.2 miles of running. Regardless of the synonym or type of event, triathlons require incredible physical stamina, discipline, and perseverance.