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 Pilates, cardio cross training, and interval workouts, they tap into energy reserves with up-tempo music, and on-site baby-sitting is available to occupy tykes. 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.