Even in retirement, Usain Bolt is quick on his feet — whether in new business ventures or, well, literally. While wearing sweatpants and just casual sneakers, the retired eight-time Olympic gold ...

The acceleration (measured in meters/second^2) of Usain Bolt (left) and Dilophosaurus (right) during the 100-meter race. Journalists may use this image only with appropriate credit.

Usain Bolt has named a three-player shortlist of players he’d like to see sign for Manchester United this summer.The Jamaican ...