and developed an interactive Pilates Body Kit (St. Martin's Press, $22.95) containing two CDs, 70 flash cards, and a 64-page workbook so you can follow up at home. But the real deal is a class with her, where you'll learn how to control your "power center"athe elusive gut muscles that are crucial to good posture, back strength, and general physical functioning. Her staff offers circuit training combining cardio machines with mat work, an efficient process that gets you in and out in barely an hour. But you may find you don't want to leave: The locker rooms offer plush towels, showers, and the amenities of upscale clubs.
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