The fastest man of all time, Usain Bolt, changed the sprinting world forever by clocking the 100 meters in 9.58 seconds. But that legendary speed was not luck, but built on a demanding six-day-a-week ...

Eight-time Olympic champion Usain Bolt admits retirement has made him feel “human” again — even climbing a flight of stairs now leaves him out of breath. Once the fastest man on earth, the Jamaican ...