swimmer

A girl swims to escape a heat in front of a large cutout that raises awareness on water shortage, at the Han River Park in Seoul, South Korea, Tuesday, Aug. 4, 2015. A heat wave warning was issued in Seoul as temperatures soared above 32 degrees Celsius (89.6 Farenheit).

Ahn Young-joon/AP

A girl swims to escape a heat in front of a large cutout that raises awareness on water shortage, at the Han River Park in Seoul, South Korea on Tuesday

A long-distance swimmer dives into the Atlantic Ocean at dawn, Friday, July 24, 2015, in Falmouth, Maine. The woman is part of a group that regularly starts their day with a 2-mile swim. Many of the swimmers keep a float tethered to their bodies for safety

Robert F. Bukaty/AP

A long-distance swimmer dives into the Atlantic Ocean at dawn on Friday, in Falmouth, Maine. The woman is part of a group that regularly starts their day with a 2-mile swim

A swimmer reacts as he prepares to swim in the Serpentine lake after snow fall in central London

Toby Melville/Reuters

A swimmer prepares to swim in the Serpentine lake after snow fall in central London on Tuesday.

A swimmer practices in the waters of Copacabana beach as the sun rises in Rio de Janeiro

Ricardo Moraes/Reuters

A swimmer practices in the waters off Copacabana beach as the sun rises in Rio de Janeiro, Brazil.

Charity swimmer Sean Conway, 32, arriving at John O'Groats, in the north of Scotland, after being the first person to swim from Lands End to John O'Groats.

Andrew Milligan/PA

Charity swimmer Sean Conway, arrives at John O’Groats, in the north of Scotland, after being the first person to swim from Lands End to the tip of Great Britain. The venture over 1,448 km took Mr Conway, from Cheltenham, 135 days

Australian swimmer Chloe McCardel starts her swim to Florida from Havana, Cuba

Franklin Reyes/AP

Australian swimmer Chloe McCardel starts her swim to Florida from Havana, Cuba on Wednesday.