should i just run up trees and try to backflip off over and over again until im either good or have a broken neck?

climb stuff

Tosh.0

Jump around

Practice makes perfect-If you're in an urban area, you can climb building as practice or find a gym, park, etc. -If you're in a wooded area, climbing trees works just as well.

Make sure to be safe though-Any flips or things like that-practice on a trampoline or at a gym and master it BEFORE trying it over concrete.

join a gymnastics class- if you dont, dont expect to improve much and expect to get injured

yell PARKOUR! every time you do something

This We All Know Our Viral Videos

http://lmgtfy.com/?q=How+to+parkour%3F

Like anything in life, practice.

Practice after train your body in the gym. Then you need to learn how to win your fears when doing something new. Remember that you don't wear anything that can get stuck in somewhere like a belt.. Also get great shoes.