Worlds strongest man? Theres no such thing, I hate it when people put this label on a person, it has no meaning. What is he the strongest at? lifting barrels and sand bags in a race against other roid heads? Lets get him off the juice, in the octagon so we can see how "strong" his chin is.
I believe Mariusz did Sambo in high school, and casually dabbled in other submission art forms throughout the years, but that's all I've got.