Athletes have to be confident and I am thinking like that.

Some people start a sport just to reduce weight, or some say, 'My doctor ordered me to run and do exercise', and for others, they run for completely different benefits. But it is not like that with sport. We need to eat, we need to rest, but also we need to 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 remember in particular my first victory when I achieved a very fast time in what were perfect conditions but since then the wind has always been a factor against me.

I was the kind of child who worked hard every day with the cows and sheep - I was a very aggressive boy.

My school was six miles away from where I lived on the farm. I had to walk and run, there and back every day, through gorges and over rivers. If I was late, there was a very big stick waiting for me.