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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.)
Depends on what they are pulling...
Juli Moody pulled a 25,000lb truck for 75feet in 35 seconds
Kevin Fast (Canada) pulled a CC-177 Globemaster III, weighing 188.83 tonnes (416,299 lb), a distance of 8.8 m (28 ft 10.46 in) at Canadian Forces Base in Trenton, Ontario, Canada, on 17 September 2009.
But these of course are on wheels so once you get the momentum going its easier to pull but they still must move them from a standstill position so they need to be able to pull this weight.