Courtesy of Lexie Kelly, Waikiki Beach, Oahu, Hawaii.

As usual, a lot of really fast swimmers have descended upon Waikiki Beach for the annual Waikiki Roughwater Swim.

Japanese 2-time Olympian Yasunari Hirai [shown on left], Egyptian Olympian Mazen Aziz, defending Australian champion Ollie Signorini, American Olympic water polo silver medalist Joe Vargas, and 3-time Waikiki Roughwater Swim champion Rhys Mainstone of Australia.

In addition, International Marathon Swimming Hall of Fame inductees Paul Asmuth and Harry Huffaker will participate.

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