A 2.4-mile swim, a 112-mile bike ride and a 26.2-mile run make up the Ironman triathlon. So what possesses an overweight, thirty-something librarian who can't swim, doesn't own a bike and has two dodgy knees to take on the hardest one-day endurance race in the world? The inspirational, epic and life-changing journey from ordinary bloke to Ironman.