I can say with much certrainty from a good source that Dave was briefly doing DC training and then gave it up because it was apparently too hard. Then he went back after just not looking as solid. Whether or not her is doing it now, I don't know. When you take enough shit as Jeff Everson put it "you can get a good pump from sitting on the toilet." So not to take anything away from low volume, high intensity training but there are other factors as well.