I actually happen to own this book
Yeah, there's no real secret behind the concepts. The workouts definitely
work but how much you get out of it depends on exactly how much you put into it. If you do any "cheating" on the exercises, then you just end up cheating yourself, and it will seem like you aren't getting the benefits.
Anyway, I recommend it although mostly for martial artists. A person who doesn't practice the arts could certainly get great benefits from the book, but I think it's easier for a martial artist since it directly benefits your strength in the art and will keep you motivated. It's great for strengthening and building self-discipline.
I will soon start doing the Dynamic Strength exercises regularly. It's a great option for people who can't afford a gym membership or just prefer working against themselves