Robert "Bob" Harper (born August 18, 1965) is a personal trainer, who appears on the television series The Biggest Loser (United States).
Harper has worked as a personal trainer for celebrity clients, including Jennifer Jason Leigh. In 1999, he was cast as an extra in Melissa Etheridge's hit video for the song "Angels Would Fall" from her album Breakdown. He is featured as a trainer on the United States version of The Biggest Loser reality television series. He has been a trainer on the NBC show since 2004. In addition to working on the show, Harper has appeared in several Biggest Loser DVD workouts. Harper also appeared on the first three seasons of the Australian version of the show.
In addition to his appearances, speaking dates, and writing duties, Harper still teaches regular classes in Los Angeles and works as a yoga instructor.
In early 2010, Harper launched mytrainerbob.com, a website where subscribers can discuss weight loss and receive coaching. The success of his site led to the release of his first workout DVD series in May, titled "Bob Harper: Inside Out Method." Harper also contributes workouts to websites such as Shape magazine.
Biggest Loser 
Bob has been a Biggest Loser trainer since 2004. In season 12, his team won most of the weigh-ins. He has been the trainer that stayed the longest, which is 14 seasons. He is seen as the nicer trainer between him and the other trainers.
Personal life 
Harper was born August 18, 1965 in Nashville, Tennessee. He attended Austin Peay State University in Clarksville, Tennessee.
After reading the book Skinny Bitch, Harper became a vegetarian. In 2010, he then became a vegan for a year. That same year, PETA voted him sexiest male vegetarian of the year.
Harper stopped following a vegan diet in 2011 and now eats animal products again due to wanting "something more." 
Harper has spoken out against puppy mills and has adopted a black and white dog from the Animal Advocates Alliance in Baldwin Park, California. He named the dog Karl, after Karl Lagerfeld, because of the dog's color.
Harper is also Farm Sanctuary's 2010 Walk for Farm Animals national spokesman. 
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