This book is wordy, wordy, wordy! The author uses unnecessary words and phrases like "generally" and "usually" throughout the entire textbook. For example, his definition for agonist muscles is, "generally described as muscles that... cause joint motion through a specified plane of motion..." Or he'll say, "This is a type of joint in which the bones permit movement..." where he could have just said "This joint permits bone movement..." It's as if he got paid for every word he shoved into the textbook.
Also, a lot of times he'll add phrases such as "... of the humerus" when the item he's describing is only located at the humerus.
The worst part of the book is that the author interchanges medical terminology with lay terms at will. In one sentence, he'll say something is located on the dorsal side of the body, and in another sentence he'll say it's located on your back.
The only positive I found in this book is that the pictures and diagrams are clear and useful.
If you are a teacher, please save the trouble of having to re-write the entire textbook. Just look for a different one to teach with.