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Runners are a durable bunch. Period.

Hit them with a hot day, a one-bridge course to rub it in, and swarms of no-see-ums and other assorted bugs, and they'll still put one foot in front of the other over a half-marathon course or an easier 5k jaunt.

And, hit them with a smile as they run by with their typical determined-but-strained looks on their faces, and they'll smile right back. Point a camera at them, and the smiles will generally increase exponentially.

Route for the annual Marco Island half marathon was 13 miles from the Shops of Marco, up and over the Stan Gober Memorial Bridge in Goodland, and then back along to Marco – but with a 3-mile-or-so detour down and back along the single road that winds through Key Marco and its luxuriant greenery.

Results of the race, courtesy of an extremely user-friendly site, can be found at marcoislandhalfmarathon.com. Close to 300 ran the longer race.

Pictured are a couple of the participants.