Possibly, but it doesn't have to be only that, or without any merit. Cold baths and even winter swimming [1] (in icy water) are a thing in many parts of the wor

Possibly, but it doesn't have to be only that, or without any merit. Cold baths and even winter swimming [1] (in icy water) are a thing in many parts of the world. [1] https://en.wikipedia.org/wiki/Winter_swimming https://en.wikipedia.org/wiki/Winter_swimming