I have recently (re)discovered ice-cold showers. The most obvious advantage is you feel refreshed and absolutely energized for quite a while afterward.
More importantly, it is one of those things that are awful while doing them, but great after you did them. It really helps you get into the habit of accepting short term pain for long term personal benefits.
It also speaks to the tiny Stoic in me. I just realized that more often than not, I just jump under the ice-cold water of the shower instead of tiptoeing around it, as I used to. Don't try to avoid the inevitable, embrace it.