really man u can do parkour if u set ur mind to it. just get out there and try.
BUT! know your limits so dont start off jumping from 12 feet high to the ground. but just start off jumping over fences and climbing up garages (but then with speed) stuff like that. just go out there and start running. dont run around a short wall. go straight over it and keep on going :P
good luck and be safe ;P