Dave Scott holds the record for most Iron Man World Championship victories ever (along with his rival Mark Allen, who managed to rack up an equal number of wins). The Iron Man competition, which consists of a 2.4-mile swim, a 112-mile bike ride and a 26-mile marathon run, is one of the most strenuous physical feats in the world. And Scott won six of them, all while vegetarian. He even came out of retirement at 40 to compete again, and took second place. Even today, he still participates. In other words, this is one gnarly vegetarian dude.