And so our cells actually have mechanisms that turn off glycolysis when there is too much build up of the H plus ions in our blood. And that's exactly why eventually as we're sprinting, we have to stop because of this idea, because glycolysis is shut down as a result of this molecule acting as an allosteric inhibitor to specific enzymes of glycolysis. Now, we know what lactate is, we know why we produce lactate and we know what types of cells produce lactate. But once the cells produce lactate, what is the ultimate fate of that lactate molecule? What happens to the lactate? So we see that metabolizing skeletal muscle cells or red blood cells cannot actually use the lactate molecule in any useful way.