For 100 m., you have to go out fast but also bring it back, so we've been doing a lot of work on the back-end speed.

When you take the world record, a lot of people are going to go out there to get you, really. I kind of enjoy that. I like being chased.

Not a lot of people get to go to the Olympics - especially with the chance I've got.

I went 59.9 sec. when I was 18 and thought, 'Hmm, that was fast - let's see how much faster we can go and what the rest of the world can do to keep up.'

The roar of the crowd when you come out for a final is like nothing else: when 15,000 people are cheering you, a lot of adrenaline goes right through you.

You can easily say, 'I can go 56', but how are you going to do that?