Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very good

This book is excellent. I have been doing martial arts and boxing for over 10 years now, and all I can say it, this book is excellent. Anyone who has seen real fights knows that they are over within 3 seconds or 5 at most (95 % of fights, the other 5 % will drag out, but that is rare. Usually, the first guy who gets a head shot in wins and/or ends the fight. Anyone who has seen real fights knows this). The fact is, martial arts are great (I do more martial arts than boxing by far), but for a real street confrontation, I will take boxing any day. The author even details how to end a fight against someone using a knife or stick or club. Like I said, get that first shot in, fast and hard.The book really is good on offense and defense, and has interesting historical stuff from previous boxing eras. I highly recommend it.