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My biggest motivation is knowing what it feels like to win medals and thinking that I want that feeling again. It was incredible to succeed in Beijing and come home to your whole country behind you but, importantly, all your family and friends.

It's the Olympics. And it was a long way for me. To compete at the Olympic Games, I dreamed of any medal, but frankly speaking, I wanted a gold one.

I hoped to win a medal and hoped it would be gold. I knew I was good but didn't know I would be the one to score something that had never been done before.

I'm extremely happy that I could win the gold medal. It's a special moment in my career.

When you've won a gold medal and you're at the top of your sport, everyone's trying to beat you. I find that incredibly motivating.

Winning the Olympics was an amazing feeling, but afterwards, it was a bit like, 'What do I do now?' So I lost a bit of motivation going back into training and competitions; I had so much pressure on me. I kept thinking, 'I'm the Olympic champion. I can't lose' - being only 19 and having to deal with all that pressure.

I'm just glad my gold medal's at home, because I'd hate to try to win another.

When I chose athletics, I knew I wanted to be Olympic champion, and now I have done it in London.

My goal is definitely a gold medal still in Rio.

When I picked athletics, I knew I wanted to be an Olympic champion.