"Hitting the wall" in long endurance events refers to when your protein runs out as a source of ATP.

Name: "Hitting the wall" in long endurance events refers to when your protein runs out as a source of ATP.
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"Hitting the wall" or "bonking" in long endurance events actually refers to when your body's glycogen stores are depleted, leading to a sudden drop in energy and fatigue. Protein is not the primary source of ATP during exercise, carbohydrates are.

"Hitting the Wall" in Long Endurance Events Refers to When