DIANNE DANIELS, M.A., has a master’s degree in exercise physiology from Columbia University. A former health educator with the New York City Department for the Aging, her advice has been quoted in Self,Fitness, and many other magazine, radio, and television shows. She is on the faculty of the American Council of Exercise and has taught academic and practical courses for fitness professionals since 1992. A certified Feldenkrais practitioner, Pilates instructor, yoga teacher, and personal trainer, she now practices in Boothbay Harbor, Maine.