Read the synopsis for the next episode of THE BIGGEST LOSER: COUPLES Season 9 Episode 4 airing on Tuesday January 26 (8-10 p.m. ET).
Episode Synopsis: This week starts off with a high-stakes pop challenge in which contestants race for the prize of immunity - and the winning team also gets three envelopes to give to the teams of their choice with instructions that could have a dramatic impact at this week's weigh in. Also, tensions are high between the trainers and one team suspected of game play, and a lifting competition rewards the winning team with a prize that everyone wants. Alison Sweeney hosts the series, and trainers Bob Harper and Jillian Michaels also star.