Instruct: Classify Amazon reviews into positive or negative sentiment
Query: very little factual information

Pavel is obviously a great athlete, however his books are filled with very little information about anatomy and physiology, and could be condensed into perhaps 10 pages. The Dragon Door marketing machine pushes these type of publications and kettlebells as a fitness revolution. I own 4 of Pavel's titles and they are essentially empty pages. If you are indeed using kettlebells, avoid by all means holding your breath during the exercise, the Valsalva maneuver as suggested in these books!Save your money, instead look at Steve Maxwell's 300 workout (see my review of this product, it is excellent), for example, or for those of us not into ballistic movements, Yoga for Real Guys. For the ultimate in exercise theory, get Ken Hutchins book on Super Slow exercise, or Dr. McGuff's upcoming book.