ANTHONY B. CAREY, M.A., C.S.C.S., C.E.S., is the biomechanical consultant for Jazzercise International and is a continuing education provider for the American Council on Exercise, the National Strength and Conditioning Association, the American College of Sports Medicine, and the National Academy of Sports Medicine. He has successfully employed the exercise regimes described in this book for more than a decade through his company, Function First.