Kellen has been doing Parkour for a couple years now, and he thoroughly enjoys it. When we were in CA to celebrate my parents' 50th anniversary we were able to stay in town for the Fujimoto July 4th Picnic. While we were at the park, Kellen put some tape between the poles of a pull-up bar and was jumping between the tape and the bar, raising the tape after each attempt. I took some movies of him and split out a few frames from one of them to blend into one photo. You can see that he indeed was leaping up from the ground and cleared the red tape. The vertical supports moved quite a bit during his jump.
Click on the photo to see a larger version.