Ballet dancers have the strongest, most beautiful, probably the most envied bodies in the world. How do they stay slender and willowy while maintaining the extraordinary energy it takes to perform night after night? Can a nondancer or an amateur attain a dancer's figure and a dancer's vitality? And keep it? Here, in The Dancers' Body Book, the legendary ballerina Allegra Kent discloses the health, weight-watching, and relaxation secrets of some of...