*** This review is for the 4th edition, superceding my 3rd edition review.
Buying this new edition, especially since I thought the third edition was a good enough start, was a matter of integrity. I'd blistered the editors for not organizing the book well, and took the author to task for some vagaries in his descriptions and the lightness of graphical assistance, i.e. crummy drawings and mediocre photographs.
I can say that the editors improved the book significantly. The organization of the chapters is now more-logical, and it also begins in a very direct, simple manner that gradually adds complexity as you read. Which is fine, since concepts introduced earlier are laying a foundation of knowledge required for the later , extremely scientific chapter on how muscles, tendons, and ligaments work together to move your body in three dimensions.
I enjoyed the new edition more than the third, and I was very pleased with the updates and corrections. I believe you still need to invest some sweat to extract any value from this, but I would surmise no one is picking this up for light reading: this is an owner's manual for your body in some respects, and it requires hands-on application.
The fifth star is not forthcoming, and I don't think a fifth edition will change this. The photographs and stick figures you loved to hate from prior editions are still here, and I can't help wonder why the publisher didn't just run a contest at SVA or Pratt for book illustrators.
Still, there's less excuses for readers to employ if they can't figure out a good routine after reading this book, and Thomas Kurz's admonishing commentary is hilarious: I can actually see him as a professor taking some of the dimmer student body to task for not fully reading the relevant material. The FAQ section alone is worth the price of admission.