The contestants are faced with the "ultimate temptation" this week when each team enters a room filled with each player's favorite foods. Whoever eats the most calories gets to choose which team will go train with the "unknowns" and the new trainers. Later, the stakes are high with a calorie-counting challenge that will give the winners what they want most - letters from loved ones back home. The trainers confront a contestant they think threw the last weigh-in, and later, trainer Jillian Michaels puts trainer Bob Harper through an intense yoga workout to show the players what they'll ultimately be able to do once they lose weight. Then one player takes matters into their own hands to try and send a contestant home.

It's Valentine's Day on the ranch, and host Alison Sweeney ushers the contestants into a room full of chocolate candies for a holiday-themed temptation. Whoever eats the most chocolate will have the option to trade two players on their team for two players on the other - or to keep the teams the same, and the winner will be a secret. But as teams are divided into red vs. black, the winner's choice causes upset in the house. Later, a five-part relay race challenge tests the players' endurance, speed, agility, strength and knowledge. Trainer Jillian Michaels takes one contestant horseback riding, and one team gets to enjoy heartwarming videos from home before a weigh-in results in a Biggest Loser record being broken and another player heading home.