The focus here is primarily on the use of assymetry through straight and curved lines to show the direction of force in the body. This is covered in other books, but not this extent. Other methods treat this material as secondary to contour and gesture, here it is the focus of a drawing. The book is filled with excellent ,forceful examples of using rhythm, shape, and line to bring out the life in a subject.
There is one weakness here. The author does cover many things beginners need to know, but goes over them very quickly. While a beginner could learn from this book, perhaps a little experience with the basics would be helpful before coming to this book.
The author is an animator and besides appealing to other animators, his clean style would appeal to those interested in sketching or reportage, a subject which the author devotes a whole chapter to.