This is the first edition of Heavy Duty that Mike Mentzer came out with in 1979, and very different from the subsequent edition from 1993. These are Mike Mentzer's original thoughts and method of Heavy Duty, that would evolve in time to become  even more abbreviated. A classic read on the logical philosophy of Bodybuilding by one of Bodybuilding's most intelligent characters, Mike Mentzer. Ebook 49 pages long