1. Our twentieth century lifestyle means we need to exercise to maintain good health
2. This site shows us how to sit at a computer and how to exercise so that we don't injure ourselves
3. If you are relaxed your collarbones are horizontal
4. You should sit neither of the above
5. The monitor should be at eye level
6. Your feet should be flat on the floor
7. If you don't take note of your posture, and you don't do some stretches and take regular breaks you may suffer a serious injury
8. You'll feel a stretch down one side of your neck if you bend your head towards your armpit
9. This site suggests 6 different stretches you could do
10. Our twentieth century lifestyles are not ideal for our health
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