The teams hit the road for the ultimate temptation town: Las Vegas, where the trainers teach skills for a hotel stay ranging from eating right when confronted with a buffet, to finding ways to workout within their hotel rooms. A card game that offers the chance to win up to $5,000 comes with high stakes - losing their trainer for the rest of the week. The team challenge for the opportunity to choose who sits out at the next weigh-in and to win a return trip to Vegas with their families consists of a relay race in the hotel swimming pool.

A team's spirit drops as its number dwindles, and their trainer hopes a pep talk from a surprise visitor from the past can make a change. However, even the effect of the visit on the team can't prevent a storm of personality clashes, which boosts the confidence of the opposing side.

The miserable performance of one team during previous weekly challenges spurs them to not only work harder during work outs, but to work harder on the teammates relationships with each other. Faced with the challenge of an exhausting uphill climb, the red team follows Jillian on one of its most dangerous workouts to date. The week's victories and frustrations culminate in the most emotional weigh-in yet!