"On a cloudy Saturday morning, the Islands Brygge Harbor Bath is brisk with swimmers peeling off layers of clothing, before soaring off a wooden pier and landing with a splash into the icy river. It’s January in Denmark, and temperatures are hovering around the mid-30s. The water isn’t much warmer, but no one is batting a (semi-frozen) eyelash—it’s all part of the fun." - Regan Stephens