Every October, the world’s fittest triathletes will gather for the annual ritual that is the Ironman World Championships. The week is a virtual who’s who of the endurance world, with the roster of participants and spectators including all manner of superstars. But all the marketing money and hype aside, there’s something else that makes the event unique — it’s the fact that on Saturday, one day, everyone from PROs to lottery winners line up to test themselves against the elements and the world’s best.