Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Only for former athletes

This book was a total waste of time and money for me. This book might be good if you are a former athelete, has has experience with exercises of this kind and had people coach you in the past. For an Electric Engineer like me that has back pain due to spending 12 hours sitting behind a computer screen, this is way to overwhelming.The stretches alone took me forever to understand and almost an hour to go through. After that I was so sore that I couldn't excercice on the next day or so.I still believe the best approach is to look for professional help. In one hour, a qualified instructor can demonstrate how to do things properly without getting hurt.