Inside an industrial, functional fitness studio, Phenomenal Fitness's six-member training staff slings personal training and group routines designed to exponentially boost muscular power through movement-based exercises. Trainers lasso between two and five clients per semiprivate session, addressing each trainee's exercise goals in a 60-minute routine. Much like the Partridge Family during their rebellious years, students perform solo routines on the same stage as the trainer occasionally jumps in to tweak techniques in order to ensure safe execution of moves. Those who opt for Kettlebell Bootcamp classes spend 60 minutes swinging handled weights that wield an imbalanced shape in order to force the core to engage and stabilize the body with each move. Instructors guide both fitness newbies and seasoned athletes through workouts designed to improve endurance, bulk muscles, and burn calories, sending energy levels soaring and rendering traditional English handbell workouts obsolete. Classes meet Tuesdays and Thursdays at 6:30 p.m. and Saturdays at 9 a.m.