For me a day without training is like a day without eating.

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.

The more you are getting older, you lose a little something. Of course there is another advantage, because of your long experience you can use it.

When I had no shoes I was comfortable - I used to run barefoot. When I wore shoes it was difficult. To run in shoes was ok, but at the beginning of my career it was hard.

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

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'.

I know what I want when I start a marathon: to win! But what do you want? Make sure you're clear in advance and don't go out too fast.