Have you ever ran? silly question, what i mean to ask is have you ever ran to the point where you have wanted to stop? Your body and your mind have had it. They want you to stop because you are reaching that point that you are out of their physical and mental COMFORT zone? Quick side-note, i don’t mean the type of wall or “bonking” out that causes you to collapse out of a genuine depletion of stored energy from your body, don’t do that.