if you would have actually noticed his point of axis at his torso, if he wasnt inverted his feet would only be 3-4 feet off the ground... how does that seem so impossible especially if he was jumping off of a log.
its really not that high. the angle of the shot is what makes it look so high. when i was a gymnast. i could do that on the ground and a balace beam which is 4 in wide and 4ft off the ground.