I turn the shower as cold as it gets at the end, and stand under it as long as I can. It helps me wake up, probably something to do with endorphins or whatever. I think the "health benefits" of it are vastly overhyped. If you enjoy it, do it. Otherwise, don't.>>194533
Just fyi I've been doing this since I was a kid and I'm stressed, depressed, and completely lacking in discipline. Yeah, evidence for any of that is thin.