If regular triathlons seem a bit tame for you, you might have your sights set on the slightly more challenging IRONMAN. Dubbed ‘the hardest one-day endurance race in the world, The 2.4-mile swim, 112-mile bike and 26.2-mile run, is not for the faint hearted. But, after months of training and preparation, and probably quite a lot of blood, sweat and tears, crossing that finishing line will make it all worth it - plus you get to call yourself an IRONMAN!