S1, E1: Fitness and lifestyle expert Jackie Warner begins "Thintervention" with eight pampered clients who are unhappy with their weight. After a basic training workout in order to assess their fitness levels, the clients are told to remove all sugar from their homes. Trouble brews when Jackie discovers some clients still haven’t eliminated sugar from their diets. The following afternoon, Jackie introduces her extreme workout, an intensive outdoor obstacle course that pushes the clients to their limits. The new clients undertake an emotional group therapy session in which clinical psychologist Dr. Ramani helps and conduct their first weigh-in.