Aaron Mattes started formulating Active Isolated Stretching almost thirty years ago and in his new books he thanks others for capably teaching his method. The difference between the founder and the students is Mr. Mattes constantly strives for improvement and the subtle changes in positioning and protocol in these latest works bear this out. Im a nationally certified personal trainer specializing in stretching and strengthening. Over the past several years of using the Mattes Method, Ive had clients get relief from chronic pain caused by numerous conditions. They have defied prognosis and have recovered to lead lives of normalcy once again. My clients have amazed their Dr.s, even at the Mayo Clinic. Do I get these results 100% of the time? Of course not. But these kinds of results are typical for me using Active Isolated Stretching. The information in the first dozen pages lay out the scientific and medical basis for the common sense approach of the Mattes Method. His references are sound and accepted. Mr. Mattes politely refutes some of the "traditional" stretching styles and backs his with physiological laws. Ive worked with NCAA champions, a couple of Big Ten Athletes of the Year and even Medaled Olympians who will attest to the effectiveness of the Mattes Method. I have several colleagues throughout the states and abroad achieving similar successes. This book delivers the over 200,000 hours of clinical and field experience that has brought Aaron Mattes international attention and acclaim. The book should be on every physical therapist desk and in every massage school library. My wife has anklyosing spondylitis and her hip replacements are both over 17yrs. old. The Mattes Method saved her from a return to a wheel chair