I can still improve a lot, but there is definitely a limit to what the human body can do.

I looked up to Don Quarrie and Michael Johnson when I was younger. They were the best in the 200m which was my main event growing up.

I have learned that if this is what I am going to do, and do it well, then I have to avoid drinking.

Rihanna, Beyonce and Nicki Minaj - we may not win, but we would have a lot of fun [in 4x400m relay team].

Rio would be my last Olympics.

Worrying gets you nowhere. If you turn up worrying about how you're going to perform, you've already lost. Train hard, turn up, run your best and the rest will take care of itself.

I am doing what I do [athletics] because the fans love it and it's a part of me, it's my personality. I think people come to see you run fast, but they also come to see a show, a performance. They want to see a personality, and that's what I give them.