I've always known that sporting people frequently suffer from joint problems because of the repeated strain they put on their bodies to get to the top. But somehow I never thought it would happen to me.

I don't intend to stay around any longer than I feel I can be No. 1.

I like the pressure of having to perform so people will come to me.

I never competed against athletes. I competed against perfection.

I want to be remembered as a person who felt there was no limitation to what the human body and mind can do and be the inspiration to lead people to do things they never hoped to do.

When I decided to go for four gold medals I planned it out over a few years. It was in four different events and there was a lot to it.

Whether I'm 40, 50 or 60, I'm going to be as physically strong as I am able.