Bob Harper, The Biggest Loser and Jillian Michaels
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Bob Harper and Jillian Michaels worked together on The Biggest Loser for years. Harper was a trainer on the show for the first 16 seasons before transitioning to host for Seasons 17 and 18. Meanwhile, Michaels served as a trainer for Seasons 1 and 2, 4 through 11, and then 14 and 15.