A comeback in gymnastics is almost impossible in itself.

I started from zero and went back to the basics in gymnastics.

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.

I had a constant fear, a constant little doubt in my mind: 'OK, I'm getting ready to do my standing back full on beam and I might re-tear my ACL.'

I told myself after 2008 that I was done for good. But they say you can't keep a gymnast away from her sport.

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.'

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