Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The absolute best defensive football book to date

Do you want to know the principles behind the zone blitz? Want to know how to develop a winning gameplan? If your answer is yes, this book has all of that and more. From coverages to fronts, this book goes in detail on how to do it all. If you are an up and coming defensive coordinator, or just want to know more about the defensive football. This is your Bible. There is no book out there right now that describes a complete package any better.