ice swimming

 

English Wikipedia has an article on:

Winter swimming

Wikipedia

ice swimming (uncountable)

1. The practice of swimming in a gap or hole in the ice of an iced-over body of water.
   • 2011, Steven Munatones, Open Water Swimming, Human Kinetics, page 8:

     The most serious cold water swimmers participate in competitive ice swimming events in bodies of water less than 41 °F (5 °C), sometimes carved out of frozen rivers or lakes and part of the International Winter Swimming Association and the International Ice Swimming Association.

   • 2015, Alexander Armstrong, Land of the Midnight Sun: My Arctic Adventures, 2016, Penguin Random House (Corgi), page 62,

     Because I am going Ice Swimming, I am meeting a club of Tromsø Ice Swimmers.

   • 2016, Harald Haarmann, Modern Finland, McFarland & Company, page 100:

     Winter swimming (or ice swimming) is not for everybody. People with a heart condition should not practice it.

Although ice swimming and winter swimming are not, strictly speaking, synonyms, they coincide in regions where open water ices over (only) in winter.

• (swimming in icy water): winter swimming

• ice swimmer

•   Open water swimming on Wikipedia.Wikipedia