Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A Must Have!

This book really is a MUST HAVE for any student of Martial Arts! It is exceptionally valuable in helping the student keep track of their growth and progress! It is well organized, well written, and contains everything a student of the Martial Arts could possibly want! Clearly the author has exceptional expertise in the Martial Arts and has provided this wonderful book as a tool to encourage others towards excellence! I've also read his Ultimate Jujutsu: Practices and Principals, and I look forward to additional titles.