Mac, this is because the structure and contents of the training load as prescribed by Dr. Verkhoshansky, with respect to a concentrated strength block, are characterized by much greater height and breadth with respect to the physiological impact. This is tolerable due to the nature of the block model in which the stress imposed by the speed work would be virtually insignificant as this won’t be ramped up until subsequent blocks.
Alternatively, in Charlie’s model, we’re simply talking about bumping up the intensity of a training component that has been present in the training all along.