If this 4 hour book is the one I am thinking it is, no need to spend any money on it. It outlines the 80/20 rule, where you can derive 80% of the benefit with 20% of the effort and how the last 20% of benefit is derived from 80% of the effort.

It then focuses on deadlifts being one of the exercises that engage about 80% of the body's muscles and focuses on a short deadlift workout on a consistent basis.