The book isn't written by a single author; it is a curated collection of work from industry giants. When you study these pages, you aren't just learning "correct" anatomy; you are learning stylized anatomy from professionals who work for Marvel, DC, Disney, and DreamWorks. You get to see how different artists solve the same problem: how to make a punch look heavy or a kick look fast.
You don't need the book to start learning today. Find screenshots of fight scenes from animated movies (like Spider-Man: Into the Spider-Verse or Samurai Jack ). Pause the movie and draw the pose. This is called a "Master Study" and is a time-honored, free way to learn action anatomy. Masters Of Anatomy Fighting Poses Pdf Free Download