Harper's latest book is The Skinny Rules: The Simple, Nonnegotiable Principles for Getting to Thin

Bob Harper

Bob Harper is a world-renowned fitness trainer and star of the NBC reality series The Biggest Loser, which finished its 13th season in 2012 and the author of the #1 New York Times bestselling book, The Skinny Rules: The Simple, Nonnegotiable Principles for Getting to Thin. Harper still teaches a local spin class in Los Angeles, where he resides with his dog, Karl. For more information go to mytrainerbob.comPhoto by Firooz Zahedi. 

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