Meet the New Celebrity Fit Club Contestants!

Kevin Federline: Now

The former backup dancer says sons Sean, 5, and Jayden, 4, (with ex Britney Spears) help him burn calories. "It was easier to eat more when they were younger because they weren't as active," he says. "Now all of them want to play sports, hit the T-ball and run around the backyard and ride bikes."

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