It’s freezing cold (ok not that cold, around 12 degrees in the water) and it’s time to go skinny dipping!
There’s this Swedish phenomenon called “vinterbada” which literally translates to winter bathing. It’s by the sea, there’s a sauna on the pier, and either you warm up before you go in to the water or you don’t. Depends on your level of stamina. Either way you most certainly do it afterwards if you don’t want to end up with a nasty cold. It sounds a bit crazy, yes I know, but it’s supposed to be very healthy and increase the level of endorphines in your body.