Allison Callender and Kent Willis, members of Mekanix Gym, a total wellness center, take a cold plunge in ice after a workout at the gym's Shadow Sanctuary facility during hot weather in Houston, Texas, U.S., July 19, 2023. (Photo by Adrees Latif/Reuters)

Participants bathe in ice-cold water during a ceremony at Teppozu Inari Shrine in Tokyo, Japan, 12 January 2025. 80 men and women took part in the ice water endurance ceremony to purify their souls and pray for good health in the new year. (Photo by Franck Robichon/EPA/EFE)

A view of the silhouettes of people, passing across a bridge over the frozen Lake Murat, trying to go on their daily lives despite the cold during winter season in Agri, Turkiye on February 10, 2025. (Photo by Abdullah Soylemez/Anadolu via Getty Images)

Sandy Bell stands with her golden doodle dog Ozzy looking out at the golden sunrise breaking through the tree on a cold and frosty morning at Bowden Loch near Melrose in the Scottish Borders, South Scotland on February 7, 2025. (Photo by Phil Wilkinson/The Times)

A man stands on a jetty on the fog-shrouded Victoria Harbour Wanchai in Hong Kong, China, 22 March 2022. Fog is common in Hong Kong in spr​ingtime when the territory is affected by alternate cold and warm air. (Photo by Jerome Favre/EPA/EFE)

The waning moon sets behind leafless sumac trees on a crisp, clear morning, Thursday, December 15, 2016, in Portland, Maine. Much of the northern Mid-Atlantic and Northeast will stay cold for the next couple of days as the arctic air remains stuck over the northern Appalachians, the National Weather Service said. (Photo by Robert F. Bukaty/AP Photo)

Macaques huddle together for warmth at a hot spring in Nagano, Japan in the last decade of December 2023. Known as snow monkeys, the animals soak in the 40°C water every day during cold weather, spending their bathtime grooming, snoozing and playing on visitors’ camera tripods. (Photo by David Lazar/Animal News Agency)

Bathers brave the cold waters of the North Sea as they take part in the annual Boxing Day dip at Redcar Beach on December 26, 2023 in Redcar, England. The event attracts hundreds of people each year, with many wearing fancy dress, who take to the water to help raise money for a number of charities. (Photo by Ian Forsyth/Getty Images)