Emil Zatopek, of Czechoslovakia, competed in the 1952 Helsinki games, winning the 5,000-meter, 10,000-meter, and marathon races — despite the fact that he had never run a marathon before, the BBC reports.
"I was unable to walk for a whole week after that," he said after winning. "But it was the most pleasant exhaustion I have ever known."
The Pierre de Coubertin medal was presented to Zatopek posthumously in 2000.