Parkour is the art of moving through your environment using only your body and the surroundings to propel yourself. It can include running, jumping, climbing, even crawling, if that is the most suitable movement for the situation. Parkour could be grasped by imagining a race through an obstacle course, the goal is to overcome obstacles quickly and efficiently, without using extraneous movement. Apply this line of thought to an urban environment, or even a run through the woods, and you're on the right path. Because individual movements could vary so greatly by the situation, it is better to consider Parkour as defined by the intention instead of the movements themselves. If the intention is to get somewhere using the most effective movements with the least loss of momentum, then it could probably be considered Parkour.