The final product of aerobic glycolysis is pyruvate. Glycolysis occurs in the cytosol of a cell and provides two molecules of adenosine triphosphate (ATP) per molecule of stored glycogen that is broken down.
A cell has multiple ways of producing energy. While glycolysis occurs under both aerobic and anaerobic conditions, the pyruvate that is produced can be further turned into energy along with NADH and H+ in the Krebs cycle. This cycle is able to produce an additional 36 molecules of ATP per original glucose molecule, although it is much slower than glycolysis. The Krebs cycle is favored when stores of glycogen are low and need to be conserved, or when energy is not needed in a rush.