Former athletes, including Olympians and professional football players, try to get back in shape and change their lives.
A lottery determines which contestant goes home with their trainer; two eliminated contestants vie for a chance to compete for one more week.
As the trainers and contestants get to know each other, one player refuses to discuss what led to her weight gain; the contestants race through an obstacle course carrying a punching bag; Dr. Huizenga meets with the players; weigh-in.
The contestants take part in two challenges, including one that tests nutrition knowledge, in order to gain pound advantages at the weigh-in.
The challenge winners get to sideline a member of the opposing team; the players must air race across a canyon and put together a puzzle.