September 19, 2011 12:00 PM

>TENNIS LESSONS

YOU STOPPED PLAYING TENNIS AS A PRO IN 2003. WHAT HAPPENED?

At 21, I had my real huge back surgery. My body needed a break: I had been training six to eight hours a day since I was 5. They said recovery would be three months, then six months, then a year, and then I just went through a growing-up period.

HOW DID BIGGEST LOSER COME ABOUT?

When I found out Jillian was leaving, I went after it because it was the perfect opportunity. It was about health, fitness and diet, and I could relate to them being scrutinized for how they look: too this, too that, not good enough.

WHAT DOES YOUR FAMILY THINK ABOUT YOU BEING A CERTIFIED PERSONAL TRAINER?

They were, like, this is brilliant. You like to be a leader, you like telling people what to do! You repeat yourself a gazillion times like a parrot—because my mom repeated things with me—and that will come in handy with the contestants.

HOW ARE THINGS GOING WITH YOU AND BOYFRIEND ENRIQUE IGLESIAS?

Beyond well! He’s incredibly supportive and happy seeing me doing what I love. I’m really happy and lucky.

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