ROCK JAW Neck & Jaw Strengthener for MMA fighters
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09-17-2012, 12:10 PM
Join Date: Sep 2012
Rock Jaw kills 3 birds with 1 stone.It targets the jaw and front and back of neck. It targets the front because of the tight clutch on the mouth guard. I always hated the neck exerciser with the strap on the head..that was annoying to use.
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