Boxers stretching jaw

It stretches the skin on your face making it less succeptible to cuts.

It equalizes the pressure in the sinus and ears similar to when you want to make your ear "pop" so you can hear when at altitude.

They're loosening their jaw muscles, so they can take a punch better. If your jaw is all stiff, it's going to hurt a lot more.

It could be that they are just trying to psych their selves for the fight :confused: :confused: :confused:

if you get hit in the jaw anybody can drop you

stretching and strengthening there jaw muscle to prepare it to take a blow

maybe warming up the skin and such , cause if u do it for a few seconds ur chin warms up if uv ever been hit when ur bodies cold it hurts twice as much. the same when the cut man is curesing the body in the corner at the end of rounds