If you were to run as fast as you can, you would only be able sustain this intensity for a short time The primary metabolic pathway being utilized would be:

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The Cori cycle is the process of converting glucose to lactate and then back to glucose in the liver. During intense exercise, the muscles generate lactate as a byproduct of glycolysis, which can then be transported to the liver and used to generate glucose through gluconeogenesis. This is the primary metabolic pathway during intense exercise because it allows the muscles to quickly produce energy, but it can only be sustained for a short amount of time before fatigue sets in. The electron transport chain and citric acid cycle are aerobic pathways that require oxygen and are used during lower-intensity exercise. Lipolysis is the breakdown of lipids (fat) for energy, which is also used during lower-intensity exercise.

If You Were to Run as Fast as You Can