Do boxers do anything to try and improve their chin?

It doesn't raise someone's overall threshold but the better stamina you have the longer you can maintain that threshold.

 

Poor old Amir too.

 

Floyd has a superb chin.
his patent plate lift neck workout
Might have as much to do with his ability to absorb a punch & not just slip / avoid them.

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They chew on air

 

Not sure if neck exercises help. Maybe.

I still believe that generally the guys with the relatively larger craniums usually have better “chins”. Small pea heads usually get put to sleep easily. Usually. There are exceptions the rule on either side, of course.

 

very wise indeed