I've watched a few videos of Parkour exploits and been quite fascinated. I was similarly enraptured by the early chase scene in Casino Royale. The practice of vaulting, rolling, falling and landing gracefully is either very impressive or very silly, depending on your point of view. I'd like to be able to do some of the things I've seen, if only to perform better in various youth group games, but I don't know where I'd go to learn such a thing. Perhaps you just have to watch videos and teach yourself.
Mokalus of Borg
PS - Youtube has a large selection of videos.
PPS - I should start by attempting much smaller things than I see there.