Do you type with good posture?
I learned to type "by the book," both feet flat on the floor, back straight, not supported on the chair, etc. Now, however, I fall so far that my cheeks hurt after a while, and I developed a very bad habit to turn my thumbs in the space bar. My teacher strike would be aghast!
Not possible for me to have good posture, I have a extreme case of scoliosis of the spine.
RSI - typing injury - prevention keyboard mouse arm supports Yogitype