@christianr_ Impressive without a doubt. But also visually unpleasant to look at. Liek others have said, it hurts to just watch. I guess it is rather impossible to make this tricks look good.
@buumba Should be fine, even with the hollow blocks.
I use this bar with similar construction, that's a lot cheaper: https://hop-sport.de/klimmzugstangen-dipstationen/hop-sport-klimmzugstange-zur-wandmontage-hs-2003k.html