Here are a couple concussion videos that I have found recently…
This first one from Mayo Clinic is an AWESOME example of what happens at the lower levels when you try to push through a concussion and keep doing what you were doing;
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I was watching this video and looking at good example of how NOT to hit. Most of these hits are from 2010 or before, and you know what, I really feel like we seeing less and less of these hits in the game. Perhaps the rules actually being enforced are making a change?
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The Concussion Blog 