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Triathlons present one of the most challenging tasks in endurance sports. During the course of a triathlon, athletes must run, bike, and swim their way to the finish line. Distances include several standard lengths, from the shortest course, known as a “sprint,” to the most grueling, known as the “Ironman.” In a sprint-distance triathlon, the contestants swim 800 meters, bike for 12.5 miles, and then run for 5 kilometers. In the Ironman, contestants swim 2.4 miles, bike 112 miles, and then run the distance of a marathon, 26.2 miles.