If you are going to take hits to the head - rugby, boxing, mma - make sure you have a strong neck.
The cervical musculature may play a role in mitigating head impact severity among collegiate football players. Sports medicine professionals and strength and conditioning coaches should continue exploring the potential benefits of cervical strengthening programmes on head injury prevention.
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May help with neck injuries, but the only way to really protect the brain is to not get hit in the head.