I keep seeing reference to the difference between linear and undulating periodization. Isn’t that an academic argument? Isn’t all training adaptation undulating? The body does not adapt in a linear manner. We may write linear progressions but that is not what happens in reality. Unless I have been missing something all these years isn’t periodization the timing of the application of training. It is why you do what and when you do it. No mysteries, just good planning based on pedagogy, experience and science in that order.