swim

Men perform a traditional dance in the i...Men perform a traditional dance in the icy winter waters of the Tundzha river in the town of Kalofer as part of the Epiphany Day celebrations on January 6, 2014. As a tradition, an Eastern Orthodox priest throws a cross in the river and it is believed that the one who retreives it will be healthy trough the year as well as all those who dance in the icy waters.   AFP PHOTO / NIKOLAY DOYCHINOVNIKOLAY DOYCHINOV/AFP/Getty Images

Nikolay Doychinov/AFP

Men perform a traditional dance in the icy waters of the Tundzha River in the town of Kalofer, Bulgaria, as part of the Epiphany Day celebrations. As a tradition, an Eastern Orthodox priest throws a cross into the river and it is believed that the person who retrieves it will be healthy throughout the year, as will those who dance in the icy waters Read more

Luka, almost two-year-old male polar bear, swims in his new home at the zoo in Wuppertal, Germany. He was born in the Netherlands and is meant to be the play partner for female polar bear Anori who is the same age.

Roland Weihrauch/EPA

Luka, an almost two-year-old male polar bear, swims in his new home at the zoo in Wuppertal, Germany. Born in the Netherlands, Luka has moved to Germany to be a companion for female polar bear Anori, who is the same age.

A Siberian tiger swims in the water of i...A Siberian tiger swims in the water of its outdoor enclosure in the zoo in Duisburg, western Germany on July 23, 2013. AFP PHOTO / DPA / FEDERICO GAMBARINI   GERMANY OUTFEDERICO GAMBARINI/AFP/Getty Images

Frederico Gambarii/AFP

A Siberian tiger takes a swim in its outdoor enclosure at Duisburg zoo, Germany, on Tuesday Read more

Liam Tancock takes part in the Mens Open 100m Backstroke

Lynne Cameron/PA Wire

Liam Tancock takes part in the men’s open 100m backstroke on the first day of the British Gas Swimming Championships at Ponds Forge sports centre, Sheffield.

A Free Syrian Army fighter dives into a swimming pool inside a house in the old city of Aleppo...A Free Syrian Army fighter dives into a swimming pool inside a house in the old city of Aleppo June 24, 2013.

Muzaffar Salman/Reuters

A Free Syrian Army fighter dives into a swimming pool inside a house in the old city of Aleppo, Syria, on Monday Read more

A man swims in the polluted waters of river Yamuna on a hot day in New Delhi

Mansi Thapliyal/Reuters

A man swims in the polluted waters of river Yamuna on Wednesday. Temperatures in New Delhi reached 43C, according to India’s meteorological department