People pose for a photo with certificates after swimming in the ocean for the 121st annual Coney Island Polar Bear Club's New Year's Day plunge at Coney Island beach in the Brooklyn borough of New York, New York, USA, 01 January 2024. (Photo by Sarah Yenesel/EPA)

A child puts his swimming goggles on before jumping in a public pool of spring water in Japakeh, Indonesia's Aceh province on March 22, 2024, during the World Water Day. (Photo by Chaideer Mahyuddin/AFP Photo)

Norway's Casper Ruud jumps in a swimming pool after winning the Barcelona Open in the final match against Greece's Stefanos Tsitsipas in Barcelona, Spain, on April 21, 2024. (Photo by Albert Gea/Reuters)

Team Kazakhstan throw Zhaklin Yakimova of Kazakhstan into the air while they perform their routine in the Mixed Team Acrobatic during the World Aquatics Artistic Swimming World Cup 2024 - Stop 2 at Aquatics Centre on May 05, 2024 in Paris, France. (Photo by Adam Pretty/Getty Images)

Musicians play as bathers run into the chilly waters of English Bay while celebrating New Year's Day with the Polar Bear Swim in Vancouver, British Columbia, Canada on January 1, 2024. (Photo by Chris Helgren/Reuters)

Spectators jump in a makeshift swimming pool set up along the race route as the pack of riders (peloton) cycles past, during the 9th stage of the 112th edition of the Tour de France cycling race, 174.1 km between Chinon and Chateauroux, central France, on July 13, 2025. (Photo by Marco Bertorello/AFP Photo)

This photo taken on August 7, 2016 shows mahjong enthusiasts playing mahjong under water in a swimming pool at a diving club in the Chinese city of Chongqing. Only participants with proper diving certification were allowed to take part in the underwater competition. (Photo by AFP Photo/Stringer)

Bottlenose dolphins swim over visitors in water tank at the Hakkeijima Sea Paradise aquarium-amusement park complex in Yokohama, southwest of Tokyo, Tuesday, July 21, 2015. Temperatures in Tokyo's metropolitan area neared around 96 degree Fahrenheit, or 35 degree Celsius, on Tuesday. (Photo by Shuji Kajiyama/AP Photo)