Build your center of power! Stronger Abs and Back shows how to develop the body's most important source of energy and support - its core muscle groups. The abdominal and back muscles form the foundation for enhanced fitness and athletic performance. Featuring 165 exercises and packed with training advice, this illustrated guide is your training manual to rock-hard abs and strong supportive back muscles that prevent low back injury and pain. Stronger Abs and Back is for athletes and fitness enthusiasts who want firm, high-performance bodies.