Two words that allow Firm Fitness to crush all its girlyman competitors: hypoxic chamber. Michael Jackson ain't got nothing on this contraption that creates a more efficient, thus shorter, cardio workout. From what New Times understands, the treadmill, encased in glass, is temperature-controlled -- read: average 58-60 degrees. It purifies, stabilizes, and thins the oxygen, which makes you breathe a little harder and sweat a little more to create more red blood cells. Remember the Olympic controversy over blood doping? Well, the hypoxic chamber lets you do something similar without causing an international scandal. The Firm complements the chamber with washboard-abs, muscle-step, and yoga classes. If you haven't had enough after these, try the roomy, circuit training area, which offers standby Atlantis equipment as old as 1997. Or for those who like the latest, there's the Cybex VR2 machines, which allow smooth and comfortable resistance and weight training. For those who are easily bored, hang out in the EZone section and hook up your headphones to local radio and television shows. The basic annual fee is $499, which includes two sessions with one of the gym's eight trainers. Premiere membership lets you use the chamber, take spinning classes, and bronze yourself silly for $599. Monthly rates are available.