It's good to be difficult to know. Too many people are too easy to know.

The stopwatch doesn't lie. The tape measure doesn't lie.

You can be an Olympic champion in 9.5 secs, but to be the greatest, there's more to it. It takes a bit of forethought and a lot of mental application.

I'm obsessive. I want to know the answer to how good I am. Most people aren't.

I am only about winning and getting better.

I am an education ambassador, mainly working with schools.

I was in the doldrums for a while after my athletics career ended in 1992. I spent six to eight hours a day training, for 18 years, and it took a long time to get over the regret that I wasn't competing in major championships any more. All I ever wanted to be was the best. But I find new projects and I keep things in perspective.