Did you know that ice bathing has a long tradition in many northern countries? In Finland, Sweden, and Russia, swimming in an ice hole is quite 'normal'.
Also interesting: in science, water temperatures below 5 degrees Celsius are referred to as ice swimming, while anything above 5 degrees Celsius is considered winter swimming. But whether it's 4 or 9 degrees Celsius, both are very cold!
As with everything, the question of the purpose of ice bathing arises, besides the great photos and videos for Instagram, of course ;)