One of the defensive football books that I read this summer was Coaching Footballs 46 Defense by Rex Ryan and Jeff Walker. This football coaching book is a must have for our coaching library. I love Rex Ryan. I watched him speak on one of the COOL clinic DVDs three years ago and recently on HBOs Hard Knocks with the New York Jets. He is a coach I wish I would have had the opportunity to play for and would die for an internship opportunity with him and the Jets. Ok, so let me dream. :)
Buddy Ryan's 46 Defense gained exposure with the 1985 Championship Chicago Bears. And because the defense is so widely identified with the Bears, it is sometimes known as the "Bear." The Defense focuses on the run so its great for all football levels even youth football teams where the run is king.
I highly recommend this book.