Hap Ki Do, The Korean Martial Art of Self Defense: Practical Hap Ki Do Textbook Book

Overall, like Galang's other books, this is a commendable work, and is a great documentation of Filipino Martial Arts techniques and expression of their philosophy. I don't think that one could conceivably learn Sinawali from this book alone, but it nonetheless is an impressive work that Eskrimadors will value.
The historical information on Sinawali and the Pampagan region is very interesting. While I have read criticism from certain circles on Sinawali, in my experience, Sinawali can help to develop both ambidexterity and a simultaneity of attack, defense, etc. in open-handed fighting that can be of great benefit to the martial artist. I had years of open-hand training before Eskrima, but Eskrima enhanced my open-hand skills tremendously, and some of this came from numerous Sinawali drills I had done over the years with partners, on the bag or dummy, etc. The repeated claim that Sinawali is the precursor to mastery of Espada y Daga (Sword and Dagger, though usually it is more properly Olisi, single stick, and Baraw, a specific type of dagger) is a sensible one, for the ambidexterity required of Sinawali is required for Espada y Daga. The majority of the book is sequences of pictures of Sinawali techniques, and one should weigh the efficacy of this type of presentation relative to one's needs before purchasing it, I think.