I'm not a marathon runner (although I did run a half marathon on my 21st birthday with almost no training) but the phrase "hitting the wall" has always stuck with me. For those of you who wouldn't consider yourself to be athletes either, "hitting the wall" is a term used in endurance sports. Hitting the wall: a sudden fatigue and loss of energy which is caused by the depletion of glycogen stores in the liver and muscles. You’ve been running for miles and miles, and suddenly you have to stop because you have nothing left in the tank. [...]
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