The certified trainers at Sweat, A Body Transformation recognize that boredom is one of the biggest reasons people give up losing weight. To keep workouts fresh and interesting, they have developed rigorous boot camp–style classes in which students get to sample a smorgasbord of workouts. Each morning and evening session has participants flipping tractor tires, toning cores with kettlebells, or honing functional strength by painting Mr. Miyagi’s fence. The expert trainers eschew shouting and intimidation, opting instead for positive reinforcement. After classes, students can cool down inside the center’s fully equipped locker rooms.