And the process of glycolysis itself does not actually regenerate these NAD plus coenzymes. And if we don't regenerate the NAD plus coenzymes because we have a limited supply of these coenzymes in our cells, glycolysis will essentially end very quickly. And so under aerobic conditions, we use the citric acid cycle to regenerate those NAD plus molecules. Now let's suppose we switch from a slow jog to a very fast run. So now we're essentially sprinting. What will begin to happen now?