I've worked really hard on getting into the box more and being closer to the goal, which I think has brought real benefits to my game. It's definitely improved my goal scoring.

At Milan when I was younger, I worked a lot on the leg press because I'd lost a bit of my natural speed as my body was changing. I was growing too fast for the rest of my body to cope and I had some knee problems. I worked really hard in the gym to regain these fast sprints.

Only Bayern Munich really have some sort of a guarantee to win if they only catch a good day. All the others need really good days to win. I like that.

Few years ago I did 30m in 3.7 seconds. Whether that makes me quicker than [Usain] Bolt, I don't know! We all know Usain is the best.

In football you never know, but generally speaking, I feel more than comfortable here [in Borussia Dortmund]. There' s no place on earth I'd rather be.

[Didier] Drogba sent me a text message after I won the African Player of the Year award. It made me very happy.

Didier Drogba and Samuel Eto'o, two fantastic African footballers. So successful. And very nice characters as well. I got the luck to know them personally. They helped me a lot.