I'm into my second year of extreme Scottish showers -- first 5 minutes as hot as I can stand (and keep turning it up as I get used to the temp) ... last 5 minut

I'm into my second year of extreme Scottish showers -- first 5 minutes as hot as I can stand (and keep turning it up as I get used to the temp) ... last 5 minutes as cold as it goes. I expect there are legitimate physical health benefits; however, for me, the main benefit is the challenge & discipline of it, of stepping out of the shower thinking that the hardest thing I'll do today may already be behind me.