Instruct: Classify Amazon reviews into positive or negative sentiment
Query: You better be serious!

There is a lot of information in this book. Maybe too much. Even though it says "Serious" in the title, the writers are trying to target everyone from beginners to professionals; they are trying to be all things to all people in all stages of strength training. In doing so, they have muddled the waters. They lose you (at least they did me) in all the definitions, classifications, descriptions, explanations, and reasons. Plus, they are promoting their products. (I guess I can't blame them for that.) It is not a bad book for those that are really serious about strength training. The information is there for those who are meticulous enough to extrapolate it and dedicated enough to put it t use. For those people, I give the book 4 ? stars. For the rest of us who prefer a simpler, more straightforward approach to improving our bodies, there are better books out there.