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.

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If you watch Superman backwards it's about a flying superhero who travels forward in time to kill his girlfriend.

If you watch Titanic backwards it's about a bunch of Polar Bear Club members who build a giant ship in the ocean and sail it to New York.

Tags for this video have been changed from 'pond, ice, face, plant, ouch' to 'pond, ice, face, plant, ouch, Russia, Russian, polar bear club, ice, schadenfreude' - edited by Krupo