Curious to know how celebrities squeeze fitness into their daily lives? Want to know the secrets of the stars? Bi-weekly, our That's Fit fitness expert Fitz sits down with the celebs we want to know more about, and digs out their great and not-so-great methods to staying healthy.

Nastia Liukin was the darling of the U.S. gymnastics team this year as she conquered Olympic Gold in the All Around competition and proudly added to her collection four more medals. That would be three silver and one bronze; I personally would kill to have just one in any color. She's Russian born, American bred and now working with the Secret Sport Challenge to help make other athletic dreams come true. I scored this interview this week while she was promoting the Challenge and bringing attention to the twenty $5,000 scholarships being given away to help others achieve their sporty goals. Nastia is ridiculously fit and has some great advice to help you look better, feel stronger and live longer.

Fitz: How many hours a week do you train before a competition?

Nastia: Before the Olympics I trained for about seven hours a day. It included about two hours of warming up and conditioning, and the rest of the time was spent practicing routines and skills on the events.

Fitz: If you weren't a professional athlete/gymnast how do you think you'd pursue fitness?

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Carrie Underwood recently displayed the best kind of fitness -- fitness of the body as well as the spirit. She took part in the 8th Annual City of Hope Celebrity Softball Challenge, showing off her batting skills while raising money for City of Hope, "an innovative biomedical, research, treatment, and education institute dedicated to prevention and cure of cancer and other life-threatening illness." Judging by the pictures, it looks like Carrie might really have some skills!

Janet Jackson is once again relying on a hardcore workout regiment to get into superstar shape before her comeback tour (scheduled to begin September 7). Six days out of the week, she spends an hour working out in the morning, loosens up for a bit, then dances ... for eight hours!

I remember reading about her fitness routine the last time she got her body into completely amazing shape -- it was really tough, but incorporated all kinds of fun things that she loved to do, like dancing and playing basketball. What a smart way to approach fitness!

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Here at That's Fit, we're constantly telling you what we think about things, but sometimes it's nice to know what you think. So from time to time, we'll ask you a question. Don't be afraid to speak up -- we love feedback.

2007 was the year that many celebrities got fit and slim. And you know what? Good for them. Losing weight takes hard work and dedication, whether you're a celebrity or not. Some stars battled the baby weight, while some simply decided to tone up and trim down. In any case, here are some of my favourite celeb slim-downs -- let me know who tops your list, either by voting below or leaving a comment:

Best Celeb Slim-downs

Gorgeous singer Carrie Underwood is gracing the cover of the current issue of SELF Magazine, in an article that supposedly about how she changed her body. However, as the Skinny Website points out, it's really just a short article on her current habits. Here's what she has to say:

• On Fitness: "I try to exercise as much as possible. I work out at home four or five times a week. I do the elliptical in the morning. I do arm weights, but I have the body type that if I do too much, I'll get big. I play basketball, swim or, when I'm on the road, I walk around and see where I'm at. "
  
• On Food: "My healthier habit would be being conscious about what I put in my body. But it's a good to splurge sometimes! My food indulgences are pizza, and I love chocolate, ice cream and cheese. Not many people know that. I have a big problem controlling myself with the cheese."

Sounds like she's a great role model for fitness, and I have to agree with her on the cheese thing -- I am a cheese addict too.

What do you think about Underwood's healthy habits?

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