Bolt atoned for his false start in Daegu by comfortably retaining his 200 title before anchoring the Jamaican 4x100m relay team to win gold in a world record time.
The 25-year-old returned to training three weeks ago at a "high intensity" level.
"Injury-wise I'm good," said Bolt, whose 2010 season was curtailed by injury which he said meant this year's campaign revolved around him "getting back into shape".
"No problems so far," he said. "Hopefully I can keep it that way. I'm doing my core exercises, my back exercises, hamstring exercises... everything just to make sure the injuries stay away this season."
With the London 2012 Olympic Games looming, Bolt said he was "fully focused".
"This is a big season and you have to try and get ahead of the game because a lot of athletes have started their season early.
"The Olympics is the biggest stage for an athlete, I know the value of a gold medal... when the Olympics come around, athletes show up on the day so I'm focused on everyone."
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