Rulon Gradner is in training here. The former wrestler is trying to lose a massive amount of weight.

Push, push, push! Jillian Michaels gets up in the grill of a contestant in this shot from the 2/1/11 episode of The Biggest Loser.

This is a scene from the sixth week of The Biggest Loser. Shave those pounds, people!

Alison Sweeney surveys the group in this shot from The Biggest Loser. The red team looks ready to go!

The teams head to a football field in this scene from The Biggest Loser. It's from the eighth week of the competition.

Wow! What a transformation!

Olivia Ward went on The Biggest Loser. She went on to win it, too!

Amazing job, John Rhode! This 41-year old lost 220 pounds during his run on The Biggest Loser and earned the winter 2011 championship as a result.

David Brown, Rachel Frederickson and Bobby Saleem advanced to The Biggest Loser Season 15 finale. Rachel took home the title.

Rachel Frederickson has won The Biggest Loser. Check out her incredible weight loss here.

Rachel Frederickson lost 155 pounds on The Biggest Loser. Is she now too thin?

The Biggest Loser is one of the most popular shows on TV. It's really all NBC has going for it.