I remember the story told of Paul Anderson who was one of the strongest men ever who was already squatting 900 over pounds in training in the 1950s before anyone used steroids he was in an airport one day and someone trust his hand at him and challenged them to a game of thumb wrestling and Anderson absent nindedly pulled wth his thumb not even seriously and dislocated the guy's thumb. Imagine grappling with a guy who weighs like 400 pounds and who can drive a nail through 2 wooden boards with his thumb and even his grip alone can probably damage you!