Michael Ventrella

Find out who will be named this season's Biggest Loser!

Family rules in this season of the reality weight-loss show, with four teams of married couples and four parent-and-child teams competing. After learning about physical age versus biological age, the players get serious about getting healthy.

A fan favorite returns to carry on the weight-loss journey and inspire Shay, a social worker who earns the unenviable title of heaviest player ever. Other contestants striving to improve their health include a firefighter, a coach and a young widow.

Following a special two-part format, this competition between weight-loss teams goes down at both the Biggest Loser ranch and in the real world. In each episode, hosted by Caroline Rhea, contestants focus on personal as well as team goals.

The acclaimed weight-loss reality series continues to help overweight people work away their excess pounds with the help of expert fitness trainers. In the show's third season, contestants join from all 50 states for a truly national competition.

Two new trainers and a twist on immunity are added to the new season, which features former Olympian Rulon Gardner as a contestant. During an exciting trip to New Zealand, the players learn how to eat healthy, count calories and exercise on vacation.

NBC's reality series examines America's fight against obesity by focusing on a group of men and women who are grappling with their weight. Participants in this debut season follow an intense diet and fitness plan while living together under one roof. Each week, the cast members are weighed and vote one person off the show. Competition is fierce as contestants vie for a cash prize and the title of "The Biggest Loser."

Fourteen overweight contestants arrive at the Biggest Loser Ranch and are surprised to be immediately divided into two teams: men against women. Challenges include competing in zero gravity, a steep uphill climb and resisting temptation in Las Vegas.

In the finale, all of "The Biggest Loser" contestants from the season return for a special reunion and a chance to weigh in one last time.

In Alison Sweeney's first season as host, the show features three teams instead of two, with Jillian leading a band of six rejected contestants. The competition intensifies as the players are sent on an exotic getaway, complete with food temptations.

The current crop of contestants realizes that more is at stake than just vanity when Dr. H. declares that they are the sickest group of any players ever to hit the Biggest Loser Ranch. They tackle a variety of challenges, including food temptations.

Twin brothers weighing in together at almost 1,000 pounds join 10 other teams of couples, and they are all given "medical tasks" by Dr. H. The players get to work out with Olympians in Colorado and are treated to some food tips by chef Curtis Stone.