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.

When people say, 'Hey, wanna come to our house for dinner?' I say, 'Yeah, what should I bring?' They say, 'How about the dessert?' I just don't skimp on the dessert. I make it the yummy way it should be made, and then I just don't eat the whole pan.

Boston is the cream of the crop of the marathon world. It has such history that you feel such honor just being a part of it. All the other races have pacers to get you to a Boston qualifying time.

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 enjoyed every bit of my swimming career. I think that's the most important advice - to enjoy what you do

I love to swim. When I jump in the water, I feel like I'm 12 years old again. It's really funny how it does that to me.