I want to see where I measure up against everyone in the world and everyone who has ever competed in the sport, and there's that innate sense of wanting to challenge myself. I'm competitive in all aspects.

If you have done something once, you can do it again or you can do it better. The beauty is the pursuit of the limit, not the limit itself. At least that's what I hope people realize.

It's important not to make the gold medal bigger than it is.

I always liked running as a kid. You know how eating chocolate or ice cream makes you feel good? That's the same way that running and competing makes me feel.

The desire definitely comes from within. There are only a few people who make it to this level and those are the ones who have that innate desire.

When I see my mom in the stands, it always pushes me to succeed.

Last year I was the favorite going into the world champs in Beijing, but I felt like I had to do something phenomenal in order to win. Instead of just having fun and competing, it became "I want to win so bad." But the person who wants it the most doesn't win. It's the person who executes. I still look back on that 200-meter race and say what the hell happened? I wasn't hurt, I wasn't sick, the conditions were perfect, and I ran like total crap.