For me, music makes my smile brighter during my workouts. It adds that extra something that motivates me to go further or work harder!

I think some parents fall into a trap, teaching their kids that everything is always perfect and everyone is always a winner.

To be a champion, I think you have to see the big picture. It's not about winning and losing; it's about every day hard work and about thriving on a challenge. It's about embracing the pain that you'll experience at the end of a race and not being afraid. I think people think too hard and get afraid of a certain challenge.

Tennis is interesting because the women are almost more popular than the men. In the U.S. Open, women even get exactly the same money as the men.

I have so much to learn when it comes to running. I just don't ever want it to feel like a chore. When I choose to sign up for a race or go out for a run, it's to make myself feel good, and I almost always do.

The kids know what I'm doing when I exercise, and that's powerful. So don't just tell your kids to go play outside. Take a moment off your computer, put on your tennis shoes, hop outside and help them start their game and run off some energy.

I worked at this place called Water World; it was a waterslide park. My brother and my dad framed my first paycheck from this place - which was for $0.00 dollars - because I didn't even make enough to cover the cost of my uniform!