Watch insane Russian guys do terrifying daredevil workout

Here's a stunt you definitely don't want to try at home. Just watching the video here is brave enough (we watched it through our fingers). Titled "Russians Working Out On A Bridge! 500 meters tower 2012," it features, by all appearances, some seriously insane (possibly suicidal) dudes doing handstands, pushups, pullups and other maneuvers a gajillion feet in the air -- without, as far as we can tell, harnesses. The guys in this just-going-viral video seem to be the same fellows who racked up more than 258K views in a previously posted, similarly petrifying video. YouTube commenters are aghast. "[W]aiting for the thinning of the herd as stupid people fall to their deaths trying this," writes one.