I'm retiring from competitive running, not from running. You cannot stop running, this is my life.

I love running and I will always run.

My father thought sport was something fun - he didn't know it was a way to make money. Then I won a Mercedes at the world championships and I gave it to him. From the moment it arrived my father said: 'Good, you can support not just yourself but me too'.

This is what I wanted. They tell me that London is the best field in history. I wanted to be part of that. Because everyone will be there it will be a wonderful challenge for me. You can see the best runners, how they look, how they run. For me to beat the best is what counts.

I want to go down in history.

Why should I say I will retire in three or four years? You retire the very moment you utter those words.

Age for me is just a number.