Rachel Frederickson won The Biggest Loser Season 15 in 2014 after losing a staggering 155 pounds, dropping from 260 pounds to just 105, meaning she’d shed nearly 60% of her body weight over the course of the competition. When she stepped on stage at the finale, viewers, fellow contestants, and even the show’s trainers appeared visibly stunned.

Frederickson did end up gaining back 20 pounds within a couple months of the finale. She told Us Weekly in April 2014 that she felt 125 pounds was her “perfect weight.” She also insisted that she’d lost weight “so naturally” on “The Biggest Loser.”

In a new three-part documentary titled Fit for TV: The Reality of the Biggest Loser, Netflix takes a deep-dive into The Biggest Loser, interviewing former contestants, coaches, and health experts to uncover "the true story behind the hit weight loss reality show. "