Had to look up the term: Winter swimming. Avantouinti in Finnish: https://en.wikipedia.org/wiki/Winter_swimming?wprov=sfti1 https://en.wikipedia.org/wiki/Winter

Had to look up the term: Winter swimming. Avantouinti in Finnish: https://en.wikipedia.org/wiki/Winter_swimming?wprov=sfti1 https://en.wikipedia.org/wiki/Winter_swimming?wprov=sfti1 Very popular. Never have I heard of anything other than health benefits from this.