Why Is Swimming the Most Deadly Leg of a Triathlon?

Sunday’s New York City Triathlon resulted in two deaths, both from cardiac events that arose during the event’s initial swimming leg. A 64-year-old man and a 40-year-old woman were pulled from the Hudson River before they could complete the 1.5-kilometer swim from a wharf near Manhattan’s 96th Street down to the 79th Street boat basin

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Why Is Swimming the Most Deadly Leg of a Triathlon?