ok, ill assume you havent come across this before. Glass chin, or Glass jaw refers to a boxers susceptibility to being knocked out easily.
How easily someone is knocked out is due to a few things but there is little that anyone can do about it.
Different people get knocked out more easily than others, some can be knocked out simply with a jab. You can have a great looking fighter that is really fast and skillful but with a glass chin, they will go nowhere. Amir Khan is one such fighter, its unlikely he can have a career now.
There is nothing that can be done to change this, its genetic and just how you are built.
Neck strengthening will help a tiny bit but its to do with brain function and how quickly and willingly your brain will shut itself down.
hope that helps.
__________________ There are no second chances.
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Originally Posted by Tom Yum  Ghost, you are like rogue from x-men but with a willy.
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