parkour and free running!

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I just discovered this really cool sport/activity called free running or in a less intense form, parkour. Theirs some cool videos of it on youtube: http://www.youtube.com/watch?v=uUksaD-JJgI http://www.youtube.com/watch?v=D2kJZOfq7zk http://www.youtube.com/watch?v=6dHcdSSvT6c I was wondering if anyone else has heard or even done this. Looks really cool and I'm trying to learn. Peace!