...is an activity with the aim of moving from one point to another as efficiently and quickly as possible, using principally the abilities of the human body. It is meant to help one overcome obstacles, which can be anything in the surrounding environment — from branches and rocks to rails and concrete walls — and can be practiced in both rural and urban areas.
Winston-Salem Parkour, complete with two videos and many photos mid-jump. Whee!
(I swear to God this is basically what I used to do in our and our neighbors' backyards as a kid. Except I jumped a lot lower. And I was pretending to be a Charlie's Angel so periodically I'd stop and aim my finger-gun at an invisible bad guy.)