Underwater Biking is a sport where participants ride bicycles underwater. Yes, you read that right. Underwater.
Competitors must wear specialized breathing apparatuses, which are essentially just fancy scuba gear with handlebars.
The goal is to see who can ride the farthest underwater while maintaining a speed of 10 km/h (6.2 mph) for 10 minutes.
It's a real thing, we swear.
Check out the rules and regulations.