From then on, I brainwashed myself into craving discomfort. If it was raining, I would go run. Whenever it started snowing, my mind would say, Get your fucking running shoes on. Sometimes I wussed out and had to deal with it at the Accountability Mirror. But facing that mirror, facing myself, motivated me to fight through uncomfortable experiences, and, as a result, I became tougher. And being tough and resilient helped me meet my goals.

Can't Hurt Me by David Goggins