These are the 5 hardest Ironman distance triathlon courses in the world. See 2017 Ironman World Championship video here: Triathlon Taren discusses the hardest Ironman triathlon courses in the world: Ironman Hawaii, Ironman Wales, Ironman Lanzarote, Challenge Madrid, the Norseman Extreme Triathlon, and The Brutal Triathlon. My Swim Gear: My...
