Despite being widely regarded as the best sprinter in history, Usain Bolt has been feeling far less than superhuman lately. The eight-time Olympic champion admitted he no longer runs after rupturing his Achilles last summer. "I mostly do gym workouts," Bolt told reporters at the World Athletic Championships on Sunday, September 14. "I'm not a fan, but I think now that I've been out for a while, I have to actually start running because, when I walk up stairs, I get out of breath.