Around 1925 or so, the Greek Strongman and wrestler Gust Lessis, wanted a shot at the lightweight boxing crown (which was held by Paul “The Astoria Assassin” Berlenbach at the time.)

In order to show that he was worthy of such an opportunity he gave a demonstration of strength before his grappling matches: while supporting an 500-pound slab of concrete on his chest his manager smashed it to bits with a sledge hammer. Say what you will about supporting feats, but this one is still no walk in the park!