I don't have the book in front of me just now so I can't speak intelligently to the program. But I recommend you squat one week and deadlift the next week to assure your recovery. With assistance lifts mixed to suit your goals. Both of those take a lot out of you in the key areas of quads and the lower back. I've read that the erector spinae take longer to recover than most other muscles, so that may be your ticket to sustaining progress.