Its based off working with many guys and seeing what works lol, to many young natural bodybuilders spend way to much time in the gym and think more is better and from my experience this isnt the right way to progress. Spend the time in the gym productive and make the training sessions more intesne and cut down the work load. We all respond differently and trying many different ways to train and then sticking to what works is the best approach, there isn't one way to train for the best its an individual thing. Get in the gym base and stop reading books then you will start making progress lol do what works for you and not what some book states