To have any doubt in your body is the biggest weakness an athlete can have. There are times when I physically can't get myself to go for a skill because I'm thinking, 'My knee hurts really bad.'

I'm doing four hours of gymnastics training a day, six days a week and then an extra two to three hours in a fitness center as well.

I was always known as that stocky, muscular, powerful, short, athlete. People always wondered if I was on steroids, and it was because I wasn't that long and lean, flexible, artistic gymnast. It didn't affect me too much but it got to the point where I tried to be that long and lean gymnast, and it just wasn't possible.

Everything for me started with my love of the sport. In society we're losing the fun with kids and pushing success on them too hard. Success comes from fun.

It sounds funny, but the 2008 Olympics were something that just kind of happened, and I was lucky they came at a point when I was uninjured and well prepared. As a gymnast, you can't ask for much more.

Injury taught me I need to learn how to face challenges.

My approach to gymnastics in Beijing was heavily based on the amount of difficulty I could do.