Polar plunges aren’t just for the daring

Cold-water swimming has psychological and physiological benefits at a variety of temperatures

Each year, thousands of people gather on the shore in Coney Island, NY for a New Year’s Day polar plunge.

Adam Gray/Stringer/getty images news

On January 1, some hardy souls will greet the new year not by nursing a champagne hangover in bed, but by plunging into frigid water.