Post said research showing that glycogen levels significantly drop within an hour in non-depleted subjects. I'm by no means arguing for a that amount of volume in one day as it is counterproductive in a hypertrophic (be it sarcoplasmic and myofibrillar), but that is not the goal of that particular session for him. However, it will do a something that will greatly benefit his heavy days; it will take his conditioning to a very high level and will increase both his work capacity and recovery between sessions. As I said earlier, most templates out there are poorly designed because there is zero emphasis on conditioning and, as a generality, BB'ers are in terrible shape with a very low CV threshold.