This book is made for the Martial Artist it is about all the in the Koga Ryu Ninjutsu system Kurokumo Bushido Academy Germany and the Netherlands of Shiga. Sensei Arie van den Akker is founder of ZVCNoord martial arts school in Europe and is the biggest representative of the Kuroi Ryu Ninjutsu Style. This book is in Dutch but when you read the titles and look at the pictures you can learn all the Ninja kicks at a very fast rate. After the book Sensei Arie Van Den Akker will show you how to make the special ninja stretcher yourself.