Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Asthma Control Technique

This is an outstanding book! I have been having some asthma symptoms, adult onset, and it was frightening to say the least. With this material I learned a different way of breathing, I learned the connection between panic and anxiety and asthma so as to be less frightened, and I simply feel better. I think everybody should read this, and not just those with asthma or emphysema. I didn't realize that the body won't die from an asthma attack unless medications are being used which alter the body's response to asthma. That fact in itself took a lot of fear out of my breathing difficulties, thus helping me to breathe easier.