Do that after 10-20 minutes in a sauna and it'll go from "augh!" to "ahhhh".

I am disappointed. Zero swimming seen.

It was the dive that did it for me.

....ever sit in a hot tub for a while, and then decide it's time to go back into the actual pool.

...and then go "Holy Balls, this pool is FREEZING"

That is why your comment will not work, and would instead be, from "augh!" to "AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH"

It depends on how you define "work". I've done it before; in Finland going from BRUTALLY hot sauna (like 90's C hot) to a lake that was probably just above freezing. You don't want to stay in long, but the cycle puts you into sensory overload mode and it feels really good unless you push the time spent in either extreme too long.

I've also done it in Colorado with less of an extreme temperature gap. Saunas in the US usually run a lower temperature (usually they try to keep them under 120 F or so) but you can make them feel hotter by pouring water on the heater stones to crank up the humidity. I've gone from that to rolling around in snowdrifts, and the effect is again quite nice as long you don't stay in the snow too long (probably under a minute).

Maybe I just have genetics like those crazy Polar Bear Club dudes.

*wtf *water

Adding video to channels (Water, Wtf) - requested by ant.