George Chuvalo had the greatest chin in the history of contact sports. 93 fights and never knocked down once. Foreman, Ali and Frazier couldn't even make his legs buckle. Here he is explaining what he believes makes a great chin. : MMA

George Chuvalo had the greatest chin in the history of contact sports. 93 fights and never knocked down once. Foreman, Ali and Frazier couldn't even make his legs buckle. Here he is explaining what he believes makes a great chin. : MMA:

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