Alongside Harper was fellow straight-talking coach Jillian Michaels, and despite the pair competing as team leaders, each hoping their contestants would be the ones to lose the most weight at the weekly weighing in ceremony, they seemed to share a close and loving friendship.

Michaels was a trainer on “The Biggest Loser” for seasons 1, 2, 4-11, 14, and 15. She often motivated contestants by yelling at them or insulting them. In one clip from “Fit for TV: The Reality of the Biggest Loser,” Michaels pushes a woman to keep exercising even after she vomits on a treadmill.

"Biggest Loser" trainer Bob Harper opened up about his 2017 heart attack, including the reaction of his costar Jillian Michaels.