So, there’s this thing called the Central Governor Model of Fatigue, and it basically argues that our physical limits are controlled by our mind and our minds perception of how close we are to damaging ourselves. So, for example, when it comes to fuel storage, you will never, ever, completely run out of fuel. It simply won’t happen because you would die if you did that and your brain is very against you dying. So, instead, to use runners parlance, you “bonk.” And by bonk, I mean that your brain is like “No way Jose, we don’t have that much left in the tank and we need that fuel to keep your heart beating and your lungs moving oxygen and your brain working. So, you’re gonna slow down.”
