1. Yes, I have. My back hurts very much because I spend a lot of time front of the computer.
2. I’m sure because my back is sore.
3. You can take breaks each hour/you can move your head forward and backward/ you can move your hands.
4. I think that the best exercise is stand sit with the hands by sides and look straight ahead and slowly bed you head to the left and right towards the shoulder.
5. No, I don’t do any exercises during working.