First let me explain what I mean in the title of my review by the word comprehensive. I don't mean that its just a book with zillions of exercises, though it certainly has more than most people would ever need. But it is comprehensive in terms of giving you a lot of the science behind resistance training, the kinesiological aspects of what the different exercises do, and it covers many functional types of exercises. It also covers the concepts behind program design and periodization. It is similar in many ways to his "Muscle Mechanics" book in terms of the exercises covered and exercise science, but it's put together quite differently. I prefer the layout of this book much more because of the way he places the exercise science and programming aspects before presenting the specific exercises. One section really builds into the next beautifully! I am a Certified personal trainer and I have gotten, and continue to get, a lot of use out of this book. It's also a book I recommend to clients who want to learn more about resistance training in a more well rounded way. Some of it may be more information than the typical novice trainer would need, but for those who are willing to take the time, I find it to be written in very clear, user friendly language. He doesn't try to speak in complex terminology just to make it sound like rocket science, yet he does cover a LOT of ground! This is the only book I've seen that gives a clear explanation of the Muscular Subsystems and a lot of information on functional based training (as opposed to the typical "bodybuilding" type approach). Yet it also covers more standard exercises as well. I would highly recommend this to someone who wants to learn about the "why" and "how" of resistance training rather than someone who just wants to be "spoon fed" exercises and routines. You can find the typical exercises and routines in most fitness magazines or bodybuilding books which basically regurgitate the same information over and over again. This one fills the gap that those types of books have left wide open. Also, to get a book with this much information at such a reasonable price is incredible, as most books of this quality would be considerably more expensive! Another book I highly recommend for both fitness professionals and interested non-professionals is Douglas Brooks "Effective Strength Training", it's very similar in terms of it's thoroughness, with extremely detailed explanations of exercise technique and sound exercise science as well! If you are really into resistance training they are both worth having in your fitness library! HIGHLY Recommended!