RIO DE JANEIRO -- Rio de Janeiro's main beaches bustle with commotion on sunny weekends. But activity ground to a near standstill on one stretch of sand. People held up their phones to record athletic feats they'd never before witnessed, or even imagined.

The game? Footvolley, a combination of soccer and beach volleyball. The athlete? A 3-year-old border collie named Floki.

Floki sparks wonder among bystanders, because he hangs tough in a game that even humans struggle to get a handle on. Footvolley rules are essentially the same as beach volleyball, but with a slightly lower net and, like soccer, players are forbidden from using hands and arms. Floki springs up from the sand to drive the ball with his mouth. He has become something of an internet sensation in Brazil, with hundreds of thousands of followers on Instagram and TikTok.

Floki's owner, Gustavo Rodrigues, is a footvolley coach, but swears he didn't plan this. He had wanted an American Bully, a decidedly less sprightly breed. Floki came into Rodrigues' life instead and quickly revealed his potential when, at just 2 months old, he started jumping after balloons.