47. Mo Farah Distance Runner
5'5", 128 pounds
Farah is one of the most accomplished middle- and long-distance runners on the planet, taking home Olympic gold medals in the 5,000- and 10,000-meter races in London two years ago to go along with his multiple European records. Farah has turned his attention to longer distances, finishing eighth at the London Marathon earlier this year and might try the marathon at the 2016 Rio games. If he trains as hard for 26.2 miles as he did for the shorter distances, he could be a beast. "Your body is just taking a beating all the time," Farah told The UK's Telegraph. "But that's what the marathon is about—being stronger, getting the mileage in, getting back from your run, waking up the next day, going for a run, not feeling great."
Photo by See Li / Corbis