Dan Evans

Twenty-two contestants, composed of 11 pairs of family and friends, get the choice of working out with Bob and Gillian or with two unknown trainers at a separate location.

The ranch-based contestants attempt to lose a higher percentage of weight than the unknowns in order to get immunity; Dr. Huizenga talks to the contestants about their health.

The unknown trainers are revealed and share their personal stories; two contestants compete for a two-pound advantage at the weigh-in; a water-carrying challenge.

The contestants are tempted by their favorite food; the winners of a calorie-counting challenge receive letters from home; Jillian Michaels puts Bob Harper through an intense yoga session.

The final four contestants take part in a cooking competition; season 10 winner Patrick House cheers the contestants on during a tough challenge.

The remaining contestants learn they will all be on the same team this week; the players compete to see who can prepare the best low-calorie meal in under 30 minutes; trivia challenge.