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Biology

Energy Systems: Aerobic and Anaerobic

Quick fact

The aerobic system produces about 36 ATP molecules per glucose molecule, while anaerobic glycolysis yields only 2 ATP per glucose—but the anaerobic system can fire up nearly instantly.

Why this is interesting

Ever wonder why you can sprint for only 30 seconds but can walk for hours? Your body doesn't have just one energy system—it has two very different engines.