This is very impressive, not to knock him but this is not unusual....it all comes down to how strong your legs are and if most of these guys are squatting big it will correlate to their box jumps. Look at UFC fighter GSP he jumps a great height out of water in a pool onto the edge of the pool. There are a lot of young people doing this and capable of doing this...to say average person, no, but if you go into a college athletics weight room it happens a lot.