For years, Bob Harper and Jillian Michaels appeared to have great chemistry onscreen while filming "The Biggest Loser" ...

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

Rachel Frederickson is opening up about the backlash she was subjected to after being crowned the winner of season 15 of “The Biggest Loser” in February.