Re: Put your Chin Up in the air if your about to be punched on it!?
Ali got away with a lot of stuff because he had very fast reflexes and because most heavyweights aren't very good. Pulling away from punches like he did, chin in the area, is a good way to get yourself scrambled. You might get away with it for a time, but you will get caught, as happened to Ali more than once, and may God help you once your reflexes slip just a bit.