"It's been rough, but I've been through it a couple times so I know what it takes to get back so I'm just pushing on and working towards what's necessary for this season," Bolt said on Tuesday morning during a training session.

His coach Glen Mills said that twice a day workouts were necessary to get Bolt ready to compete after he missed a lot of foundation work.

"We usually train in the morning when it is necessary, but it's not the routine," Mills said, noting that this year's setback was a bit more severe than 2012 leading up to the London Olympics.

"Usain has lost quite a significant amount of training time and in his desire to at least run a couple races in the summer, in order to get in the sufficient amount of sessions, we have to double up training morning and evening," Mills said.

The lanky sprinter, who also has eight world championship gold medals in his collection, said the surgery was necessary in this off year.

"I went to see my doctor and he said the best thing to do was to actually get the surgery done because it would bother me over my career, so it was best to get it done now, so I just did it because I considered this my off season. It definitely one of those things so I got it out of the way and right now I'm just trying to get back and that's the key right now and that's the focus," Bolt said.

The 27-year-old, who has penciled in four 100m races over the next six weeks, says he did not want to miss the Commonwealth Games.

"I really wanted to run at the Commonwealths Games over the years and although I got injured I see where I can run the 4x100 I see where I'm getting back into shape to actually compete in the 4x100" Bolt said, adding that he did not want to take anyone's spot in the 100m having missed the trials.

"I'm going there for my fans and I'm going there to show that I'm getting back into shape and they can look for great things now and for the years to come," he said.

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