This book has some good notes on condiitioning. The rest is just a poor attempt at trying to teach you how to fight. You can't lean that from a book, esspecially from this "Taijutsu" fighitng system their promoting. Don't buy it, get a Bruce Lee book to make up for the fitness tips your missing.
This book is a wonderfully helpful guide to some very basic Ninjutsu techniques. It covers mostly basic self-defense, however there are some rather dire moves that you would only use if someone were about to try to kill you. Not sounding too basic now, is it? I loved the Taijutsu section and the historical references. I didn't like the weapons section very much; I think they missed something in refusing to put in the Katana swords and Shuko climbing claws. For these (particularly the Katana) I recommend Mr. Hayes' other book, The Mystic Arts of the Ninja.