Hams who think they are strong are the worst.  That's what this guy was, he must have weighed over 300 pounds but could still barely move those dumbbells by swinging his entire body.    You'll notice they never do exercises where they can't cheat, like deadlifts.  Even bench they cheat at a lot by doing that ridiculous back arch and bouncing it off the massive belly.  They then try to convince themselves that they are powerlifters.  No, a real powerlifter your size would do twice the weight you're doing.  You're just cheating.