What Is Parkour?

What is it?  I've heard of hardcore parkour so I did some research.  I've known about this for awhile now but I never knew what it was actually called.  Very impressive my friends.  I don't know what basically goes through the minds of people doing this but I have to say they have more guts than I do.

Parkour is a method of movement focused on moving around obstacles with speed and efficiency. Originally developed in France, the main purpose of the discipline is to teach participants how to move through their environment by vaulting, rolling, running, climbing and jumping.  Parkour practitioners are known as traceurs.  They train to be able to identify and utilize alternate, more efficient paths. Parkour can be practiced anywhere, but areas dense with obstacles offer many different training opportunities.  Parkour is sometimes abbreviated PK. "from Wikepedia"

So there you go.  I think it's now time to go downtown or find an area with a lot of obstacles.  Any suggestions?  By the way this video is probably from a movie I just don't know which one.  I wouldn't mind watching it, plus don't you think that guy with the assault rifle should have put it to good use?