1. Yes, I know one person. she is a hairdresser and makes repetitive movements. she has pain in the wrist
2. I think that I sit correcty when I use a computer but usually, I have shoulder pain.
3. You should buy an ergonomic keyboard and mouse. You should put the screen at eye level. You have to do some exercises to avoid pain. You have to rest every two hours and walk for a while. you should have good lighting in the room
4. Yes, I think they are useful
5. I slowly bend my head to the left and to the right towards my shoulder. Also, I stretch my arms behind my back.