alot of.great information. acceptable condition The product is a vintage paperback book titled "Keys to the Inner Universe: Encyclopedia on Weight Training" by authors Bill Pearl and Leroy R. Perry. Published in 1980, this book covers topics such as training, weightlifting, weight loss, bodybuilding, and fitness. With a focus on sports and recreation, this book serves as a valuable resource for those interested in improving their physical strength and health through weight training.