Much like the Olympics or the Superbowl, the CrossFit games pairs the best athletes in their chosen sport against one another in the ultimate display of physical prowess. The eventual winner is named Fittest in the World, a title currently held by US athlete Mat Fraser and Aussie star Tia-Clair Toomey. To claim the title, athletes must compete at regional tournaments to work their way up to the world stage, where they find themselves tackling a range of high-intensity workouts designed to test even the fittest of human beings. In the UK, CrossFit superstar Zack George lays claim to the throne. The man mountain recently took out the CrossFit games, officially becoming the UK’s Fittest Man.