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THE ULTIMATE NECK AND JAW STRENGTHENER Strengthening jaws and necks across the globe! Many pro fighters are now strengthening their neck and jaw to help prevent injuries.Rock Jaw is great for boxers,MMA fighters or any athlete.Just insert the mouthpiece in your mouth; let the rock bag hang and lift your head up and down or side to side for repetitions.Rock Jaw is also a cosmetic product the exercise can help eliminate double chin.The jaw is the main target in the fight game.A strong neck and jaw can help absorb more shock to punches ! Make your neck and jaw rock solid with Rock Jaw!ROCKJAW-INC.COM