S01E571: Gym Revival Project, Trainer Jong Kook and National Team

Trainer Kook, one of the celebrities who enjoy working out, finds his gym on the verge of going bankrupt. In order to recover from the difficult situation, he invites other members to join him at the gym. As expected, none of the members are serious about the gym or the workout, and even Jong Kook finds it difficult to keep them under control.