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Extreme Unicycling: "It's all downhill from here!" - YouTube

Then I watched this one.

Extreme Mountain Unicycling - YouTube

Don't know about you but I prefer two wheels. How can you cartwheel over the handlebars properly on that? You'd just go splat.

That's is pretty amazing.

I don't see how they do it but I know it didn't come to them overnight. They must have incredibly strong thigh & back muscles!