Anna Kournikova participated in the Nautica South Beach Triathlon. Sort of, anyway. She ran a four mile portion as part of a relay team for K-Swiss. She held a very respectable 7:15/mile pace, but she had another goal that took up a good bit of her focus -- raising awareness for St. Jude's Children's Research Hospital. The tennis player regularly incorporates running into her fitness routine, so this was not a huge stretch for her. Some observers say she's lost her curves, but I think she looks fit and healthy.

Mariah Carey is showing up everywhere lately, but there's less of her to see thanks to a lifestyle change and nutrition and fitness coach. She admits she's bummed to give up her comfort foods, like mac 'n cheese, but she's thrilled to be fitting into the same size jeans she wore in 10th grade.

Not only is Britney Spears working out at Bally (she's been there one to three times a day, lately) -- she just might become their newest spokeswoman. You know, if fitness plays a big role in Britney turning her life around, then Bally might be taking a really smart risk. Or not. Only time will tell.

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Michelle Ryan looks great. Well, as the star of the new show Bionic Woman, I guess she kind of has to, but whether it's your job to look good or not, it's still hard work. She recently spoke out about the changes she's had to make to her life in order to prepare for the role. Here are some highlights:

• (On how much time she spends at the gym) "About three and a half hours a day I would say. Two hours of personal training, or two hours of dance, and an hour and a half of circuit training."
• (On her diet) "Just eating more like sushi and fish and fruit... [protein] and vegetables and cutting out -- I've got such a sweet tooth, so cutting out chocolate"
• (On changes to her body as a result) "I'm getting abs and my muscles are getting bigger and I definitely feel like I'm being much more conscious to eat healthier."

Three hours a day of working out? No doubt she looks great. Still, it's not the most realistic plan for us non-Hollywood folks.

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