The holy canon of endurance swimming says this sort of thing makes you a target.

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Known as the Coney Island Brighton Beach Open Water Swimmers, or Cibbows for short, the group considers the stretch of Brooklyn's oceanfront an ideal spot to prepare for endurance swimming in waters as disparate and famous as the Bering Strait and the Beagle Channel.

WSJ: Brighton Beach: Brookyln's Swimming Mecca

For his recent fights, including Saturday's UFC 145 showdown with rival Rashad Evans, Jones built his endurance in a swimming pool.

WSJ: Jon Jones: A Formidable UFC Champ in a Forbidden City

The latest round of testing, which began in January, focused primarily on endurance events in cycling, rowing, swimming and athletics.

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At 42 years old, I competed in the Ultraman World Championships, a grueling three-day uber-endurance triathlon circumnavigating the Big Island of Hawaii that involves 6.2 miles of swimming, 260 miles of cycling and culminates with a 52.4-mile double marathon run.

CNN: From miserable man to 'Ultraman': A fitness journey