Guys not really doing them right in the video, imo. But he's bending his legs and although it's gonna put a lot of shear stress on the back it's more likely to result in injury due to cumulative stress doing that for a long time as long as you start out light. But stick enough weight on there and try to jerk it up...yeah you could throw out your back.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.