It's eight weeks in to the competition, and the remaining contestants have already lost almost 700 lbs. But this week it might prove harder to stay on course when a challenge involving giant treadmills over water gives the winning team the opportunity to assign penalties to the two losing teams. One team is tasked with cleaning duties that must be finished before they can access their trainer and the gym, while the other team is sent without their trainer to a city full of temptations - Las Vegas. Meanwhile, at Comeback Canyon, trainer Bob Harper tries to convince his two contestants to make their health a priority rather than always taking care of others first. Then the player who falls below the red line at the ranch weigh-in and feels unprepared to return home is thrilled to get a second chance at Comeback Canyon, while the weigh-in there sends another contestant home for good.