There comes a point in every jog. At the start, midway, or towards the end, I need to halt. What keeps me going?
Clearly it’s my mind. I talk to myself. I refuse to let the body have its way.
None of this is a surprise. We human beings are creatures with free will and willpower. (I know some philosophers dispute the existence of free will but I don’t credit them.
So celebrate your mind and feed its resolve. Test it.