I am a retired healthcare professional and needed exercises to strengthen and stretch my back and neck muscles to alleviate cervical tingling and pain caused by poor posture. I also wanted safe and effective exercises based on sound science and research to improve my posture, flexibility and endurance as I am aging. Marilyn Moffat, PT, Ph.D, FAPTA is a physical therapist and the book's editorial review board consisted of physical therapists from across the country. It is an official publication of the American Physical Therapy Association.The book has excellent illustrations by Terry Boles of the correct way to do each exercise, tells you how the exercise will help you and covers exercises for the entire body. Topics covered in this 288 page book are: Part I: Chapter One: the back Chapter Two: the neck Chapter Three: the jaw Chapter Four: the shoulder Chapter Five: the elbow Chapter Six: the wrist and hand Chapter Seven: the hip Chapter Eight: the knee Chapter Nine: the ankle and foot Part II: Chapter Ten: posture Chapter Eleven: gait Chapter Twelve: body mechanics Chapter Thirteen: body weight Chapter Fourteen: footwear Chapter Fifteen: strength, endurance, and Flexibility Chapter Sixteen: sports Chapter Seventeen: work Part III: Chapter Eighteen: strength and endurance exercises Chapter Nineteen: flexibility exercisesIt is well written and the instructions are explicit and easy to understand. This book along with Age-Defying Fitness written by Moffat and Lewis, also physical therapists with doctorates, are excellent and both are bargains available on amazon.com. I am very pleased with each of these books and highly recommend them for persons who need exercises to increase flexibility, range-of-motion, balance, endurance and to correct common problems involved in maintaining independence and freedom from discomfort and pain as our bodies age.