Everything about this video seems like it should be impossible.

It was just a few years ago that we first saw videos of skateboarders and BMXers doing the loop-the-loop. It takes speed, some help from centrifugal force and a big set of balls to make this work.

Doing it on a set of wheels seems hard enough, but free runner Damien Walters has now one-upped everyone before him and done it with just his feet.

Check out the incredible video below. Seriously, what's next?

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