From tension between Bob Harper and Jillian Michaels to one contestant nearly dying on the set, the new series was full of secrets.

David Broome, a co-creator of The Biggest Loser, says in the docuseries that he got the idea for the show after seeing a desperate “help wanted” ad for a personal trainer to “save my life” on a bulletin board outside of a gym. Once the show was underway, producers searched for similarly desperate contestants.