Usain Bolt's agent says the three-time Olympic champion is back in full training and "feeling good."

Ricky Simms tells The Associated Press that the Jamaican sprinter is fit ahead of the defense of his titles in the 100, 200 and 4x100 at the London Games.

The holder of the world record in both sprint distances, Bolt lost to Yohan Blake in the 100 and 200 at recent Jamaican Olympic trials. He had his right hamstring stretched out by a trainer after the 200.

Bolt pulled out of the Monaco Diamond League meet on July 20 -- his last race before the Olympics -- with what his coach called "a slight problem."

Britain's Daily Telegraph said on Tuesday that Bolt flew to Germany last week for treatment on a tight hamstring.