Hundreds across Canada marked the start of the new year by gleefully plunging into frigid lake and ocean water, some for ...

The hole cut in the ice is above water that ranges from one foot to six feet deep. Diving is not allowed but every year a guy with a handlebar mustache, Dale Bull, bellyflops for his grand entrance.

From early ocean dips to ice-cold polar plunges, cold-water immersion is increasingly popular among athletes and wellness warriors. But how much of the hype is backed by science? In the most ...