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[Michael S Czeiszperger <czei AT webperformanceinc.com>]

On Friday 27 April 2001 01:14 pm, you wrote:
> I've also noticed that when I'm really tired, I'll sleep without tossing
> and turning much, and the same thing happens. The culprit is the lack of
> movement. Sitting for extended periods without moving is never good for
> your back, so the best thing to do is get a chair that makes you move
> occasionally. I've found that armrests also seem to encourage a lack of
> motion.
>

I wouldn't say lack of motion is the only culprit here. While you shouldn't 
"sit for extended periods without moving", in my opinion the culprit is 
sitting in bad positions. I've seen so many programmers hunch over their 
keyboards, or hold their heads at wierd angles, and it eventually causes 
problems. After spending years trying to develop the "correct" position for 
riding horses, that it seems natural that there would be a more or less 
correct way to sit in a chair as well.