By Sportsmail Reporter

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On his way: Usain Bolt

On his way: Usain Bolt

Look who's on his way to the Olympic village.

Usain Bolt, the undoubted biggest star of these London Games, used his Twitter account on Thursday to tell the world he was on the way from Birmingham to the capital.

The defending 100m and 200m champion has been training in Birmingham. There has been some talk of whether he is properly fit, especially after he didn't show up to an open training session on Tuesday.

The 100m heats take place on August 4, with the semi-finals and final on August 5.

At one stage, Bolt looked to be an overwhelming favourite, but Yohan Blake has proved to be a formidable rival this year.

Earlier this week, Bolt predicted he could run a time of 9.4 seconds, and hoped it would happen at the London Games.

'You can’t be sure when or where you can run a time like 9.4.

Sorry to see you go: Bolt poses for a photograph with volunteers in Birmingham

Sorry to see you go: Bolt poses for a photograph with volunteers in Birmingham

'But the major competitions are when I take it really seriously and shine through — that’s business time.

'It is impossible to run 9.2. The body isn’t made to go that fast no matter how hard you train, how good a shape you’re in or how good your technique.'

Treatment: Bolt grimaces, and then gets the giggles, as his physio goes to work

Treatment: Bolt grimaces, and then gets the giggles, as his physio goes to work

Bolt stunned the world at the Beijing Olympics in 2008, winning both the 100m and 200m titles with new world records.

He repeated the trick at the World Championships in Berlin a year later. At the 2011 World Championships, he won 200m gold, but was disqualified from the 100m after a false start.

Unforgettable: Usain Bolt wins the 200m at the Beijing Olympics

Unforgettable: Usain Bolt wins the 200m at the Beijing Olympics

Here's what other readers have said. Why not add your thoughts, or debate this issue live on our message boards.

The comments below have not been moderated.

Bolt is lulling blake into a false sense of security

I predict a shock. I think he will be beaten by the other fella who will run 8.7 seconds! Doesn't mean a thing anyway as the average human will be able to run 100m's in 7 seconds in 50 years anway such is the development of the human race. - Spag Bol, Nowhere, 26/7/2012 15:26 _________________________________________________________________________________________ You are not wrong about human development. However, I can't see the other fella beaten the BOLT!

My advice to Bolt is: no hot dogging this time around like in Bejing as Yohan Blake is as fast as you and just one slip up and he will certainly walk away with the gold.

I predict a shock. I think he will be beaten by the other fella who will run 8.7 seconds! Doesn't mean a thing anyway as the average human will be able to run 100m's in 7 seconds in 50 years anway such is the development of the human race.

I want those headphones.

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