I had never heard of Parkour until about two days ago. The next day I saw it again on a Bruce Lee documentary and then this morning I was watching a video on natural movement over at Free the Animal and one of the related videos was on natural movement.
Talk about primal transportation and top physical health. These people travel cities not at a jog, but running, jumping, climbing, flipping, balancing and rolling and they don't stop.
Since I'm a father now and can't risk killing myself by jumping from roof top to roof top and dropping multiple stories or doing flips, I doubt I will ever be like these guys, but I have to admit that becoming primal really does make me want to move like them.
Here's a link to the Top Gear video if you've never seen Parkour. The video is a race between man and machine.