Instruct: Classify Amazon reviews into positive or negative sentiment
Query: WORTHLESS!

This book rarely mentions specific muscles. It teaches you to stretch certain areas of the body: lower back, front of shoulders, etc.IF you are looking to stretch SPECIFIC MUSCLES, this book is totally worthless. For example, because of a medical problem, I need to stretch a specific muscle, which of course is not to be named or found anywhere in this book.IF YOU HAVE A MEDICAL PROBLEM AND YOU NEED VERY SPECIFIC INFORMATION, YOU WILL NOT FIND IT IN THIS BOOK.This book is written for children or the general population looking for a General Stretch in general areas.IF you are looking to stetch specific muscle groups, do a search on the internet, don't waste your money on this book!! On the internet, there are videos and pictures that are much more specific and helpful than this book.