I've seen that playground vid before. While it is amazing, everyone's comments about it have made me realize how few people must appreciate the degree of strength required to be even a national level male gymnast, much less international. There are probably a few thousand guys right now in the US that could duplicate those strength moves.
Watch this
This guy not only duplicates some of the same positions as the playground guy, but has to possess the strength necessary to do it on chains (not stationary iron bars) and then hold the position, while keeping those chains totally still.