Jillian Michaels stands by her decision not to participate in Netflix's new documentary about The Biggest Loser. "Zero regrets about not doing it because I would have simply lent credibility to something that is an egregious lie," Michaels, 51, told Fox News in an interview published Monday, August 25. The celebrity fitness trainer starred on The Biggest Loser intermittently between 2004 and 2014. The reality competition ran for 18 seasons and ended in 2020.