STAGE TUBE: Sneak Peek - Season 13 of BIGGEST LOSER Premiering 1/13

NBC is offering a sneak peek at Season 13 of THE BIGGEST LOSER which will include some never-before-seen surprises and twists in the weight loss competition.  Season 13 premieres on Tuesday, January 13th at 8/7c.

THE BIGGEST LOSER is a weight loss competition where contestants come together hoping to transform their bodies, their health and ultimately, their lives. Among the trainers helping them is veteran fitness trainer and author Bob Harper. Harper is the heart of NBC's worldwide hit "The Biggest Loser" and has afforded him the incredible platform to exemplify his passion and vigor as one of the most in-demand fitness specialists worldwide.

Harper is the brilliant force behind countless success stories of people that have previously given up on helping themselves, or had been written off as helpless by others. The success of the show has led to the creation of Harper's own DVDs, supplements, books, motivational speaking engagements, and personal appearances.

"The Biggest Loser" is a production of Reveille and 25/7 Productions. Ben Silverman, Dave Broome and Todd Lubin are the executive producers.

To get a sneak peek at Season 13 of THE BIGGEST LOSER, click below!