

A member of the winter and ice swimming club 'Seehunde Berlin,' or Berlin Seals, takes a dip in the frozen Oranke lake in Berlin, Germany, on Dec. 25. Every Christmas, club members meet for a swim at the lake. Markus Schreiber/AP
In Harbin, China, a swimmer climbs out of the icy waters of the Songgue River on Jan. 4. Aly Song/Reuters
On the bank of the Yenisei River, members of a swimming club in Krasnoyarsk, Russia, form a 2010 on Dec. 27 to celebrate the coming new year. Ilya Naymushin/Reuters
Members of a local winter swimmer's club in Krasnoyarsk, Russia, walk on the banks of the Yenisey River. Ilya Naymushin/Reuters
A man leaps from the wharf into the Atlantic Ocean in Herring Cove, Nova Scotia, on Jan. 1. About 100 people participated in the annual event in the fishing community near Halifax. Andrew Vaughn/The Canadian Press/AP
Enthusiasts participate in a winter swimming competition in Valdivostok, Russia, on Jan. 5. The Russian ice swimmers, known as 'walruses,' believe that their hobby helps to build up resistance to many illnesses and is crucial for surviving the long winter. Yuri Maltsev/Reuters
A member of the 'Seehunde Berlin,' Berlin Seals, winter and ice swimming club, swims with an umbrella during an annual Christmas Day swim at Oranke Lake in Berlin, Germany. Markus Schreiber/AP
Xiao Ying stands on his head before plunging into icy water in Harbin, China, on Jan. 7. Ng Han Guan/AP
A winter swimmer dives into the water at a frozen lake in Beijing, China, in January. Fa Wan/ColorChinaPhoto/NEWSCOM/FILE
A winter swimming club plays soccer on a snow-covered Songhua River in Harbin, China, on Dec. 19. Sheng Li/Reuters
People run into icy waters at a New Year's swimming event in Buesum, Germany. About 200 participants took part in the event, which had some 5,000 spectators and water temperatures around 39 degrees Fahrenheit. Christian Charisius/Reuters
Swimmers welcome the new year on the ice in Tianjin, China, on Jan. 1. Liu Haifeng/NEWSCOM
During the 90th annual Polar Bear Swim in Vancouver, British Columbia, on Jan. 1, swimmers run into English Bay. Andy Clark/Reuters
A swimmer jumps into a river on a snowy day in Taiyuan, Shanxi province, China, on Dec. 7. Reuters
At the West Lake in Hangzhou, China, on Jan. 1, swimmers jump into the lake to begin a triathlon. In 1995, Jan. 1 was named National Winter Swimming Day in China. NEWSCOM
Swimmers climb down ladders into the Vltava River for a swim in Prague, Czech Republic, on Dec. 26. Petr David Josek/AP