For years, Bob Harper and Jillian Michaels appeared to have great chemistry onscreen while filming "The Biggest Loser" together. But a new docuseries about the NBC weight-loss competition has fans wondering if the dynamic duo actually got along in real life.

Jillian Michaels rose to fame on 'Biggest Loser' — which was met with controversy from time to time — but where is she now?

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