Stress.

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Jms, its something ive been very aware of for a number of years, the stress thing. As regards impact, interestingly how it affects the CNS, reading papers scientific ones that were given to me, by guys at the uni. Surprisingly the major impact is to the spine, because of the thing on top,the head. Plus pre season in sports soccer and such, there are 38% injuries occur because of overuse. I find that interesting.Plus other things that compound the problem.

I honesty wouldn't be surprised if that number was higher. Some muscles get overused, some never get used, people do the same shit every day and never grow.

Main cause for that is eyesight believe it or not. More i look into it the more obvious it becomes, excuse the pun . It was explained to me years ago by a friend, who was head of osteopathy at Harvard, knew what he was talking about.