So what is a Fitathlon? Youve heard of a triathlon Run, Bike and Swim. Youve heard of a decathlon 10 track and field events. Welcome to a new sport called Fitathlon. A Fitathlon is a fitness challenge that tests your strength, endurance, athleticism and mental toughness. Fitahlons challenges have 15-20 obstacles that take place over a 5k or 10k distance. The obstacles include but are not limited to: Transverse Walls, 5 Foot Walls, Cargo Nets, Tire Flips, Calisthenics and many more!