In Body Evolution's recently renovated gym, rows of traditional cardio machines whir alongside an updated aerobics room and an indoor basketball court. To inaugurate their new square footage, the trainers kicked off a variety of classes, which include Zumba, boot camps, various forms of yoga, and cardio salsa. When not leading personal-training sessions or doling out nutrition advice, the staff keeps the doors unlocked 24 hours a day for all-night access to the circuit- and strength-training equipment. Ramping up results, the staff plugs patrons into a machine-assisted metabolism test that helps make nutritional recommendations such as, "Stop trying to eat this machine." To get families fit together, the gym's Kidz Zone incorporates play and health into programs such as the Wii Fit workout.