Andrew Huberman· PhD
If you get into a very cold shower and you feel as if you want to get out, but you force yourself to stay in, you're forcing yourself to stay in because your prefrontal cortex is placing some subjective label on that experience. Either you're doing it for a certain benefit or you've got a timer, and you're using the timer as the regulator of how long you're going to stay in, basically your overriding reflexes.