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With its iconic status as a colourful and exuberant hub for beach life and attractive people, Rio de Janeiro's Copacabana beach isn't usually associated with surfing.
The coastline here, along with the other city beaches, has waves generally rated mediocre by the surfing community.
Resolving to convince these naysayers otherwise, Carioca, Thiago Costa set himself the bold challenge of surfing for 100 days, each time catching a barrel wave.
It was some of Costa's companions who'd prompted him to share the exhilaration of surfing in Rio city, suggesting he upload images of himself training onto social media.
They were optimistic it might galvanise one-time surfers to dust down their boards and get back on the water.
And the 100 day barrel wave surfing challenge seems to have done the trick for Gabriel Sodre, a surfer evidently motivated by those images.
Although surfing's an activity which is close to Costa's heart, his ambition is that people might be persuaded to practise whatever water sport they find fulfilling.
Not one to rest on his laurels, Costa has a fresh quest on the horizon and next year he's intent on doubling his accomplishment by completing 200 days of barrel wave surfing.
Whichever stretch of coastline beckons to them, seasoned and would-be surfers will be able to monitor Costa's progress online.
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