And again we have to multiply this by two because we have two pyruvate molecules coming in from the process of glycolysis. And again, if we sum up all those reactions in glycolysis and this reaction, this is the net equation that we get. And notice it's slightly different than this equation here because here we produce carbon dioxide, but here we don't have carbon dioxide and we also don't have the two H plus. So here it becomes glucose plus two ADP plus two ortho phosphates produces two lactate, two ATP and two water molecules. And as I mentioned just a moment ago, during strain use exercise, our skeletal muscle cells may not receive an adequate supply of oxygen and these cells will begin to undergo lactic acid fermentation to generate those ATP molecules quickly and effectively. And in that case, there's a build up of lactate so lactic acid and that causes fatigue.