Damien Walters has no regard for gravity.

The 31-year-old British stuntman, a former gymnast and world-renowned trampolinist and freerunner, became the first man to successfully complete the run of a loop-the-loop.

In a stunt arranged by Pepsi, Walters calculates how much velocity he will need at the top of the loop to accomplish the feat. It's 8.65 mph.

Check out the video below to see Walters' triumph in all its glory as well as the science behind it. The first few minutes show all the preparation that went into the stunt, but if you want to skip straight to the feat itself, head to the 2:27 mark of the video.

A physics professor wrote a column on Wired that determined Walters was actually running at a much greater speed than 8.65 mph.

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Walters has more than 400,000 subscribers for his YouTube channel. One of his most popular videos is a compilation of his stunts and it has more than 23 million views on YouTube.

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