The Biggest Loser's Bob Harper claims Jillian Michaels didn't reach out after he suffered a heart attack. The fitness trainer, 59, was hospitalized in February 2017 when he suddenly went into cardiac arrest following a gym workout. In an interview with The Guardian published on Thursday, August 14, Harper said that many people from The Biggest Loser got in touch, but not his longtime costar. Harper was a coach on the hit show for 16 seasons before transitioning to the role of host for seasons 17 and 18. Michaels was also a trainer for 12 out of 18 seasons during the show's run.