To finish off this whole Olympics by finally getting the gold medal, it's the best feeling in the world.

I don't think I've ever not gotten nervous. When you work so hard for one special day or routine, you want to perform it better than you ever have. We always say at our gym, If you lose the nerves, you lose the sport.

I fell in love with running, and I finally have time to do it now.

In some ways the ACL tear was a blessing. I had hesitated to return to elite gymnastics after the 2008 Olympics. I told myself I had already accomplished so much, and the road was just going to get harder if I continued.

Something my mom taught me when I was little is that everything happens for a reason. Retiring was scary and it was tough to give up gymnastics, but so many great opportunities have come from it that I never expected. And those wouldn't have happened had I not accepted my injury as a way to try something new.

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.'

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.