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Unlock the Secret of a Gravity-Defying Parkour Stunt—With Physics!
Yes, you really can climb a building by jumping back and forth between two opposing walls. Thank you, Isaac Newton.
Some parkour masters can scale a building by jumping back and forth between two facing vertical surfaces, zigzagging upward. But from the safety of my office chair, I can walk you through how it works, because parkour is all about using physics to your advantage. Bottom line, if you want to do this awesome parkour stunt you gotta be strong, fast, and fearless—because if you run short of newtons halfway up, the descent is a lot faster than the ascent.
Or read this on Wired
