Parkour is all about physics. You have to know ballance, cordination, right angles and techniques. When i jump off a two story building i know how to land and roll with momentum. Once you learn to do it you can do it naturally, without even thinking about it. i have been doing parkour for almost three years. I have NEVER ingured myself. The key is to start out slow and progress. It's about knowing your limits and building on them. You have to be physically fit. Parkour keeps me drug and alcohol free. Its about improving yourself and overcoming you obstacles. I know I would make a good pilot. Every instruct I ever had(6) has told me im a natural pilot. Perhaps it's because my greatgrandfather and grandfather were borh pilots> My GGpa flew for an international airline. My grandfather flew in the airforce. I have wanted to be an airline pilot since I was 4 years old. I have spent many hours flying in airlines and have 22 hours toward my PPL. I am 20 years old and going to college for most likely accounting. Just because I don't take the time to grammer and spell check dosen't mean i'm uninterlligent! I recieved in A in english composition. Parkour is a very fun and natural sport that is USEFULL. If your ever being chased by an attacker or have to fight you can easily FLEE. If you know proper parkour your chased dosen't stand a chance. Its the martial art of escape. So please respect PARKOUR... (i'm doing doing gymnastics(freerunning ON THE STREETS0 even good freerunners make mistakes and they can really hurt themselves. Statistically speaking more people have been ingured in freerunning than parkour!