Le Parkour (also called Parkour, PK, l'art du déplacement, free-running) is a physical discipline of French origin. It is an art form of human movement, focusing on uninterrupted, efficient forward motion over, under, around and through obstacles (both man-made and natural) in one's environment. Such movement may come in the form of running, jumping, climbing and other more complex techniques. The goal of practicing le parkour is to be able to adapt one's movement to any given scenario so that any obstacle can be overcome with the human body's abilities.

According to founder David Belle, the "spirit" of parkour is guided in part by the notions of "escape" and "reach"; that is, the idea of using physical agility and quick thinking to get out of difficult situations, and to be able to go anywhere that one desires. However, fluidity and beauty are also important considerations; for example, cofounder Sébastien Foucan speaks of being "fluid like water," a frequently used metaphor for the smooth passage of barriers through the use of parkour. Similarly, experienced traceur (practicioner of parkour) Jerome Ben Aoues explains in the documentary Jump London that:

The most important element is the harmony between you and the obstacle; the movement has to be elegant ….If you manage to pass over the fence elegantly - that's beautiful, rather than saying ‘I jumped the lot.’ What's the point in that?

To some people (particularly non-practitioners), parkour is an extreme sport, to others a discipline more comparable to martial arts. Some consider it a combination of the two, recognising similarities between parkour and the stunts and techniques of Hong Kong martial arts star Jackie Chan, whose fight and chase scenes take place in industrial or urban environments. Still others see it as an art form akin to dance: a way to encapsulate human movement in its most beautiful form. Parkour is often connected with the idea of freedom, in the form of the ability to overcome aspects of one's surroundings that tend to confine - for example, railings, staircases, or walls. The practice of parkour requires considerable physical and mental dedication, and many adherents describe it as a "way of life."

A line has two sides
A very small object. Its center
Abandon desire
Abandon normal instructions
Accept advice
Adding on
Always give yourself credit for having more than personality
Ask people to work against their better judgement
Ask your body
Balance the consistency principle with the inconsistency principle
Be dirty
Be extravagant
Breathe more deeply
Bridges -- build -- burn
Cascades
Change ambiguities to specifics
Change instrument roles
Change nothing and continue consistently
Children -- speaking -- singing
Cluster analysis
Consider different fading systems
Consult other sources -- promising -- unpromising
Convert a melodic element into a rhythmic element
Courage!
Cut a vital connection
Decorate, decorate
Destroy nothing; Destroy the most important thing
Discard an axiom
Disciplined self-indulgence
Discover your formulas and abandon them
Display your talent
Distort time
Do nothing for as long as possible
Do something boring
Do something sudden, destructive and unpredictable
Do the last thing first
Do the washing up
Do the words need changing?
Do we need holes?
Don't avoid what is easy
Emphasize differences
Emphasize repetitions
Emphasize the flaws