Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Best short introduction I've read.

I count myself extremely fortunate to have been given a copy of this book by a friend late last year. I had read a few other books about the Alexander Technique, but this one got me to actually phone a local teacher and take a series of 15 lessons. The severe shoulder, wrist and neck pains I'd been experiencing for years are now almost all gone - those lessons I count as the best investment I ever made in my own well-being.If you have chronic aches and pains, by all means investigate this method. Fitness Without Stress will tell you all you need to get started. I'm about to buy a couple of copies for my older children who I think could benefit from this method.