it would be doubly intresting to know how many of them have done X amount of practice at ground level. Or if they just started running about the place. Most people who start generally do it in a padded area/relatively safe area and at ground level learning the rolls etc. (and also they teach you the rolls and how to land first and some other safety moves) Also: Addendum: i feel the off road mantra of: "Fast as nessisary, slow as possible" Or something to that effect i cant recall it, fits well with parkor. In other words, only go as fast as you need to, and be as careful as you can.