Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This book has been instrumental in relieving my neck pain!

After several years of increasingly frequent bouts with neck and upper back pain, I finally went to a physical therapist to find some relief. During the few weeks she treated me, she loaned me a copy of this book and told me to practice the exercises in it. The exercises were *so* successful in relieving my pain that I bought my own copy of the book and have made them a regular part of my daily routine. They have proven themselves time and time again to be a preventative measure against recurring pain. I can't tell you how thankful I am to have found this book!