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

The pressure points/nerve centers detailed in this book are very basic. I have been doing martial arts for only six months and I know more points than are covered in this book. Also he has a very 'Queensbury rules' attitude towards self-defense. He states that blows to the groin should not be used as it is a 'repugnant' tactic. Well if someone attacks you, you should use anything which doesn't cause them more than necessary harm. There's no place in self-defense for the niceties of sporting competition.