The Season 13 "Biggest Loser" competitors

New year, new season, new twist: Ten teams showed up believing they would compete as couples on Season 13 of "The Biggest Loser," which will begin airing Tuesday, Jan. 3, on NBC. But they got the shock of their lives: The teams were immediately split up. In an instant, family and friends became rivals.

( NBC )

New year, new season, new twist: Ten teams showed up believing they would compete as couples on Season 13 of "The Biggest Loser," which will begin airing Tuesday, Jan. 3, on NBC. But they got the shock of their lives: The teams were immediately split up. In an instant, family and friends became rivals.

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