I got this book a few months ago, and am now actively using it in my 6th, 7th, and 8th grade dance classes. Movers and Shapers by Patricia Mcnair could also be used with 5th grade classes.
For this dance unit, I begin each class with one of the 2-page spreads in the book. I like this book because of how it is divided up. Some days the students read the information, and some days I show it and read a little of the text. For example, today we explored the 2 pages about joints. I made color photocopies of the pages for each student. It gives the students a nice visual. We actually did a "read aloud" of these two pages. This was my introduction for the class. After this, we did a quick partner warm up related to joints. Then, as we did our first center warm up, I focused on which joints were being used.
Movers and Shapers is simple and clear - a great introduction to anatomy for middle schoolers and upper elementary students.