I am by no means an expert in human physiology, but the way he is running does not seem particular good for the way our body is build.
When you see sprinters run, they are tilted forward and use the quads to propel - this is now used to put tension in the rubber springs to gain some height. While it increase your speed, it is essentially wasted energy because it's not forward motion. But that just an initial impression, I'd have to try them to comment more.
When you see sprinters run, they are tilted forward and use the quads to propel - this is now used to put tension in the rubber springs to gain some height. While it increase your speed, it is essentially wasted energy because it's not forward motion. But that just an initial impression, I'd have to try them to comment more.