The feeling of fatigue known as "hitting the wall" is caused by:

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"Hitting the wall" is typically experienced by endurance athletes after several hours of continuous activity. This feeling of extreme exhaustion is caused by muscle glycogen depletion, which is the body's main source of energy during prolonged exercise. Dehydration, muscle creatine phosphate depletion, muscle protein breakdown, and lactic acid build-up can also contribute to fatigue, but they are not the primary cause of "hitting the wall."

The Feeling of Fatigue Known as "Hitting the Wall" Is