The pressure is hard. You get - the world is only watching every four years, and I think lots of people feel like they have to win in that time frame.

What's really heavy on my heart is fighting physical inactivity.

I'm an athlete who's very determined and I understand sacrifice.

My mom always has this amazing ability to always see the best in a situation. In that moment [when finished 2nd in the 200 meter race in the 2008 Olympic games] I was just completely devastated. I mean, I had worked so hard; that was my opportunity. And she was just able to turn it around for me. She helped me to be able to see the other side of things and that this is not the end for me. She's just an amazing supporter and an encouraging person and she has a unique ability to do that. And so those are the kind of things she said to me in that moment and over the next four years. When things get tough, she's always been my strength.

Everyone sees the glory moments, but they don't see what happens behind the scenes.

I myself am frustrated in just where sports are at. It's a hard thing when you're out there working every day, and you know that someone else is cheating and they may not necessarily get caught.

I was a disruptive child.