This book is by far the most clear and complete that exists to deepen the technique of karate. Each page with a technical explanation of the principles and key points, and the corresponding illustrations. All in a simple language and adapted to a young audience. Adults also enjoy a convenient standards of reference! Personally I really used this book when I was a teacher (section children, adolescents and adults) to prepare lessons. Habersetzer me thank you for so much knowledge in a form as convenient! Would recommend to all practitioners from the beginner to black belt!