There are a few books that I believe belong in every drummers library. The absolute essential books are Syncopation For the Modern Drummer, Stick Control and 4-Way Coordination. Of course there are many other great books out there such as New Breed, Accents and Rebounds and many others but these are essential.
Why is 4-Way Coordination essential? Well, as far as fluidity on the drums this book has definitely helped me the most. By the time I worked through just the first page my skill level increased dramatically. It did take a few weeks to work through the first page, I didn't just blow through it so even though this book will elevate your skill level quickly, it still takes time to really work through each exercise.
This book has helped me in all aspects of drumming. This book is focused on limb independence but the exercises will help you gain speed, off-hand development, control and fluidity. This is because each limb is exercised, the exercises don't favor one side or the other, you exercise both sides evenly.
I have heard reviewers complain that the exercises in this book don't have any groove to them. This is true, but this should not have a negative impact on the quality of this book. The purpose of this book is to gain limb independence and it definitely does that. There are plenty of books out there that teach crafty grooves, but this is not one of them and it doesn't try to be. If you can work through this entire book then you will be a MUCH better drummer, limb independence is definitely one of the keys to great drumming. Don't go in to this book expecting to learn crafty drum beats, but go in expecting you will gain so much limb independence that you will be much more creative behind the kit, which leads to crafty drum beats.
This book is definitely challenging. I believe a lot of people might give up because the author says at the beginning of this book that any proficient drummer should be able to do these exercises at the target speed (and even much faster as he says). This may discourage some because the target speeds are fast! The first exercises are 120 BPM on the half note, so on the quarter note (What most metronomes default to) that's equivalent to 240 BPM. Believe me, it's quite a challenge coordinating all of your limbs at 240 BPM, even if they are just 8th notes. People may beat themselves up and think they aren't proficient drummers. With all due respect to the author, don't pay attention to this. Start each exercise off VERY slowly and work your way up.
I work through this book one exercise at a time. My goal is to get to around 3/4 speed before moving on to the next exercise. If you try and reach the target speed before moving on then you might be working on the first exercise for months! Of course this is just me, you might be able to blaze through these much faster then I. So set a goal for each exercise, 3/4 speed, 1/2 speed - whatever - then start moving forward. I revisit each exercise every day and try to increase my speed. Once I work through a page then instead of practicing that page one exercise at a time, I practice the entire page as if it were a single exercise. This has helped me a lot. I'm sure you will find your own way to work through this book, this is just what has worked for me.
Don't give up. This book is very challenging but I believe beginners and seasoned pros can both work through it. New guys just need to start VERY slow, even if it's just 40 BPM. The hard part is coordinating your limbs, once you successfully complete an exercise then it becomes much easier to bump up the metronome - the coordination is the hard part at first. Get this book, you will be amazed how much skill you gain by working through these exercises! This book is one of my daily essentials.