I'm surprised there isn't a topic for this already. Are there any traceurs on the forum? How do you like to train? How did you get into it? Have you got a group or do you go it alone? If you don't do Parkour, would you like to? What's stopping you?
I've just started training again after a year-and-a-half-or-so hiatus because a friend of mine is interested in learning. It's a good opportunity to get back in proper shape and focus more on my fundamentals, which I didn't do nearly enough of when I started out. If you're a beginner, take it from me; get your landing and rolls down before you do anything more than four feet off the ground, and don't give vaults priority over everything else (as cool as they are).