Celebrity Fitness Gurus

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Personal trainers Jillian Michaels and Bob Harper appear on the hit NBC show "The Biggest Loser." These no-nonsense fitness experts have trained many celebrities including Gwyneth Paltrow, Ben Stiller, Ellen DeGeneres and Melissa Etheridge.

Jillian Michaels & Bob Harper

(Photo by Paul McConnell/Getty Images / January 21, 2009)

Personal trainers Jillian Michaels and Bob Harper appear on the hit NBC show "The Biggest Loser." These no-nonsense fitness experts have trained many celebrities including Gwyneth Paltrow, Ben Stiller, Ellen DeGeneres and Melissa Etheridge.