“Parkour is a movement discipline based on using only the body to interact with the environment and navigate one’s surroundings.”

It’s sort of long winded and it isn’t the kind of sentence that is going to sell parkour to an onlooker immediately, but I think that real philosophical grounding comes from strongly defined terms. Whether one’s style of parkour is efficient (fast), superfluous (flashy), direct (a to b), meandering (flow), applied (real situations), or supplemental (conditioning), I think that the above definition manages to cover the things that traceurs do.

~ Albert Kong from, http://www.lethalbeef.com/blog/?p=193

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