Exercise books often make grandiose claims of improving everything from your sex life to your cholesterol level. At best, these claims are harmless; at worst, annoying. Every so often, however, a program is developed with attention to specific issues, backed up with strong medical knowledge, and presented in a plain and helpful manner. Peggy Brill is a physical therapist who has created just such an exercise program. The Core Program offers numerous ways to improve deep muscle strength in women, which can lead to improved posture, strength, and energy levels.