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From Fellrnr.com, Running tips
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[[File:1035px-Glycogen is structure.svg.png|right|thumb|200px|A schematic of glycogen, showing a core protein surrounded by strands of glucose.]]Our bodies store carbohydrate as glycogen, the critical fuel supply for endurance running. Burning glycogen for energy requires less oxygen than fat, making it more efficient. However, the store of glycogen is limited, and when the supply runs low we “hit the wall”. Glycogen is stored primarily in the muscles, but that glycogen can only be used by the muscle it’s stored in and cannot flow through the blood to other places. Some glycogen is stored in the liver where it flows through the blood to all tissues.
=Glycogen Usage=
