Parkour
Have you ever watched those POV YouTube videos of people running and jumping from rooftop to rooftop, sometimes doing flips? Yeah, that's parkour. It's just as scary as it looks, and if you make even the tiniest mistake, you could very well kiss your pretty little life goodbye.
Dipping and Diving
While it is tempting to try to replicate what you see those wild free-runners doing, you should probably just lace your trainers up and go for a leisurely jog instead. These individuals are highly trained in both freerunning and gymnastics, typically, and any normal person attempting to try extreme parkour should be extra careful. People regularly break their legs, spines, and arms, get concussions, sometimes even die.