David Ritsema has permission to swim at Seeley Lake, a private body of water open to a gated community north of Greeley. But he still tries to get his workouts in before most of the neighbors are awake. He doesn’t want them to stare.

Ritsema, 45, trains for an event called Swimrun by, appropriately, swimming a lap in the lake, then running around the neighborhood in his wetsuit, then jumping back in and repeating the cycle.

“I’ve got my swim cap on, goggles, all of it,” said Ritsema, who works as a urologist and lives in Greeley. “I’m sure I look like a doofus.”

Maybe so, but it’s the only way to train for the event. Competitors generally refer to Swimrun as a triathlon without the bike, but it’s more than that, as they run first, then swim, then alternate between the two until the fi

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