Twenty fitness trainers arrive at the Hot House to meet host Dan Cortese and to audition one last time for a chance to compete; the trainers learn that only 11 of them will be moving into the Hot House, while the rest will be going home.

The fitness trainers run an obstacle course during which they are judged on endurance, form and speed; the trainers begin creating their own 20-minute workouts; the women spring a surprise on the men; romance blossoms.

Surprise guests teach the trainers how to lead a live class, focusing on choreography, musicality and cuing; a shocking announcement puts everyone on edge.