When I went to animation college 10 years ago, there were NO books to instruct you on actually HOW to practice weight balance, mass and volume in your character animation tests. Plenty of old books existed with great artwork, with the exception of Preston Blair's book Cartoon Animation (The Collector's Series) and later on (after I graduated) the great Richard William's book The Animator's Survival Kit. But there was nothing to actually show you step by step the principles of posing, timing and movement for hand-drawn animation, Richard's book had some nice technical stuff for walk cycles and timing, but Goldberg's book is a first for really outlining the basics efficiently.
This book IS the first and best book to lay out the principles of character movement; antics, overshoots, settles, squash and stretch, break downs, in-betweeing, timing, spacing and all the other basics needed for any classical or CG animator.
I highly recommend this book to all students, teachers and even veterans, because not only does it cover all the fundamentals but it goes beyond into more advanced concepts that ALL types of animators must know and practice, whether it be 3D, traditional paper, or stopmotion animation, this book is definitely worth it.