Parkour is a pretty hardcore sport, and when you're at the gym, you need to be paying attention! One dude leaps up and grabs onto a wall when another person comes running underneath him, not realizing the dude is back-flipping back down.
The next kids were doing something that kind of resembled parkour... We could try to explain what happened in the hilarious fail, but sometimes it's best to just let the video speak for itself.
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