Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: I have not found a better book in 25 years !

I have had this book for so long and read it so many times.It has to be in my top 5 books ever.The Kung Fu exercises and warm ups are everything,and yet there is much more.I studied martial arts for over 25 years and have not found a better book.Just buy it.