Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Tai Chi for Exercise

I take a Tai Chi class, and we use this book for two of the forms. Sometimes the photos are hard to make out, but overall this is a good companion to my class. I use it as a reference because learning from a book alone proved to be too difficult. There are many other forms and styles, so this is not the be-all or end-all of Tai Chi. Nevertheless, it is an excellent resource.