At Rx Physique Personal Training & Group Fitness, the boot-camp classes whip bodies into shape with a mix of mixed-martial-arts drills, circuit training, cardio, and isolation exercises. The expert trainers who lead those workouts helm personal-training sessions, too, which sculpt muscles with more customizable regimens. With every exercise performed, the trainers believe that it should help prevent injury—not cause it. That's why they emphasize proper technique, carefully supervising trainees.