Jackie adopts a new method in week four's basic training, sending the team on a three-mile run through Magnolia Park. Later in the week, Jackie takes the clients through an epic firefighter workout, complete with hunky firefighters. With tension building amongst the group, a few of the clients lash out at Jackie for her strict training methods. At the weigh-in, it becomes clear that the group is divided in two between those who are consistently losing weight and those who aren't.