Jillian Michaels and Bob Harper — longtime trainers on “The Biggest Loser" — appeared inseparable on screen, but behind the scenes their friendship fell apart.

Season 15 winner Rachel Frederickson lost nearly 60% of her body weight, shocking viewers and health experts at the time. The ...

Biggest Loser' trainer Jillian Michaels is disputing claims made against her in the Netflix docuseries 'Fit for TV,' about ...

Former The Biggest Loser trainer Jillian Michaels has responded to claims made by co-hosts and other accusers in a new ...

The Biggest Loser at-home prize was awarded to an eliminated contestant who lost the highest percentage of their body weight ...

Jillian Michaels, who served as a fitness trainer on the NBC reality series The Biggest Loser from 2004 to 2011, has ...

Jillian Michaels, who served as a fitness trainer on the NBC reality series The Biggest Loser from 2004 to 2011, has ...

Frederickson did end up gaining back 20 pounds within a couple months of the finale. She told Us Weekly in April 2014 that ...