Taken a few years ago at the West End Festival in Glasgow, this image was taken whilst watching a group of youths, not involved with the Festival, who had set up some obstacles to help with their practice of Parkour / Free-Running.
Having watched for a short while I was walking away when I saw this man run towards the tree. I raised the camera and grabbed a shot. If you look closely you can see another photographer in the shot who had the same idea as me.
I think I might just have been in the better position for this one.