Today, at the little blacktop skate park in Golden Gate Park, we encountered a group of people rolling around on what looked like giant metal hula hoops:
Little did we know that this is a TOTALLY LEGIT THING. How legit? It’s been on reality TV. So You Think You Can Dance, in fact:
The hoop is called a “cyr wheel” and appears to be the latest fancy-pants acrobatics apparatus. How fancy? Cirque Du Soleil fancy:
The more you know! You’re welcome, Internet!
A Bee's Life 
Respond to Cyr Wheels in Golden Gate Park