Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Rare knowledge in this book!

I've been trying to heal a wrist tendonitis for over 5 years now, and I have seen various therapists.They can't really put a name on my problem, and propose surgery, but honestly said that they do not really believe it would help. So I looked for alternative solutions, what's on the net, etc... and came across this book.First, it's a good read, an interesting one as being a self-taught guitar player, nobody ever told me to keep my back straight, correct the position of my shoulders, do this, do not overdo that... this was all in the book, and I started paying attention to my position while playing, both sitting and standing.With the advice in "The Athletic Musician", I got better, and my injury tends to fade. I'm not saying the book is THE cure, but it helped a lot. And for the story, I found another therapist, with other great advice.So I would recommend this to all practicing musicians, and I think every music teacher should have it on his/her cupboard...