45 miles, but there is a sauna...

Iced water can overstimulate the Vagus nerve, causing a sudden drop in blood pressure and heart rate, which can lead to passing out. You don't want to be passing out in a sauna.

It's the same thing that happens when you jump in a plunge pool and your breath catches.

Speaking from two years of sauna/cold plunging weekly, I needed ice water or I overheated too fast. You just sit while you're in there and don't cover your head like the crazy eastern europeans! Or if you want to lay down then get up slowly.

I ended up doing around 10 mins in the sauna, 2-3 mins cold plunge (until my core cooled down) and then back to the sauna, three times and then out drinking! It was a weekly after-work relaxation thing with fellow massage therapists. We called it Detoxing and Retoxing.