The nationally certified personal trainers at Summit Fitness motivate clients to reach wellness goals with the gym's cardio, circuit, and weight-lifting equipment. Punctuated by the metallic sounds of weights settling into racks and RoboCop crying after his first loss at arm wrestling, the instructors sculpt fitter frames in one-on-one personal-training sessions. In group fitness classes, which include cardio cross training and interval workouts, they tap into energy reserves with up-tempo music. After leaving elliptical machines, stationary bikes, and treadmills, students walk past tanning booths to locker rooms. Electronic locks admit guests at all hours to the 24-hour gym.