This is a quick explanation on integrating dry fire and cardiovascular work. Walking on an incline works well were we can work draws, reloads, transition as well of course shooting on the move. This video discusses 81s which is a regimen for reloading the gun from a certain body position to another body position. Basically, there are 9 shooting positions based on rotating the body about the spine axis and the belly button axis. We have to be able to perform from different positions other than standing upright.