[brilliant medical insights]
When I swim in a cold sea, for the first two minutes, my body gives me pain and discomfort, and shouts “get out of the cold thing!!!” in an effort to keep me alive.
After two minutes, my body says “Ah. You obviously can’t get out of the cold thing. In that case, I’m going to keep you all warm and fuzzy in an effort to keep you alive.”
Once I’m in that state, it feels wonderful, similar to the experience people say they feel when taking morphine or heroin. Add to that the ebb and flow of the waves, etc, and nothing beats it.
I expect a five-minute cold shower would deliver a similar physiological experience.
[/brilliant medical insights]