Great read, lots of good stuff that I've been pondering recently. One interesting point is that while the ideal method of keeping your body in check when long-term computing is to get up every our and stretch. But who really does that, especially on a crunch? Heck, I don't even do that for gaming!
One other thing: for the guitar, I never found my hands hurt from the constant simultaneous movement, and I can play just about every song on Expert level. If anything, that exercise strengthened my left hand significantly, to where it's more adept at certain things than my right hand. My finger movements are even different, and I'm right handed!
That said, just this last week I was diagnosed with overused muscles in my right wrist due to too much gaming and computer time. My right hand is in constant pain from it, and while I have games to review and articles to write (one of which I should be doing now for TG), even pinching hurts because of this overuse. My doctor said I should have my hand in a splinter and my arm in a sling, but there's no typing or gaming in such conditions.
And with the holidays around the corner...well, sometime this week my health will become a bigger priority than my work. And I'm not the only one with such predicaments.