We just got our first question on parkour. Is the practice on topic? I'm not aware of any competitions in parkour which would have it failing one of my more basic "is it a sport" criteria. However, it's something of an athletic activity, should it be on topic?
It is in fact a sport. If your definition requires it to be competitive, there was in fact official competitions for it.
In October of 2007, The RED BULL ART OF MOTION in Vienna was the first major competition around Parkour and Freerunning held anywhere in the world. First place was taken by WFPF/Airborn athlete Ryan Doyle, with WFPF /Tempest athletes, Victor Lopez and Gabe Nunez tying for second, and WFPF/Air Wipp athlete Marcus Gustavsson taking third.
According to Wikipedia,
Parkour is a training discipline that developed out of military obstacle course training.
Practitioners aim to move from one place to another, negotiating the obstacles in between. The discipline uses no equipment and is non-competitive.
Considering it's a training discipline and non-competitive, I would lean toward having this on Fitness SE.