Talk about getting hit to the head. Check this slo-mo video of a moderately hard hit to the head and then decide if you want this done a multiple times (never mind countless times in your fighting career) to your head - http://youtu.be/zYKpQuq4hsE. I think the issues really start surfacing when you're old and decrepit as we're starting to see with retired American football players - http://www.nytimes.com/2011/12/30/sports...&ref=health

Remember you're older for a lot longer than you're young.

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Yuishinkai Kobujutsu USA - http://www.yuishinkai.info
Martial Arts with Colman - http://www.martialartswithcolman.com