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The show-stopper for me of all these set-ups is that you cannot sit on a sofa with your legs crossed and the machine on your lap which is by far the most comfortable setting for me

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It's a very comfortable position, but not for the cervical spine. I just had an injury that according to the doc was because of this posture. I don't believe it though. Anyways, try not to sit in this position for long durations. The injury isn't fatal but will leave you with shooting pain in your arms and shoulders for weeks.

If slouching in a chair for long durations is harmful, I would have had serious problems by now. I haven't met a chair I didn't love to slouch in.

That said, I did twist out my back last year. My doc said ti was due to sports, but who knows.

http://www.ikea.com/gb/en/products/desks/desk-computer-desks...

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