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That 20x ratio is for HORIZONTAL pulling strength (which makes more sense), not vertical pulling strength.
OK, and what can a man pull ( according to this test ) HORIZONTAL ?
A man was not tested in this experiment, only bears.
But from my guess (with no slippery surface or wheels), the maximal horizontal pulling strength among several types of athletes would be:
Me at 231 pounds: 894.3 pounds exact (horizontally pulled a moveable backshed that wasn't tied to the ground, and got people to lift and weigh it on a crane scale for one of my clients.)
Professional Strongman of 360 pounds: 1100-1200 pounds?
Lightweight Powerlifter of 130 pounds: 700 pounds?
Average Man of 180 pounds: 250 pounds?
Weakest Man Ever: -1 pounds? (Just kidding on this one.)