Repetitive Strain Injury or RSI

http://orthoinfo.aaos.org/topic.cfm?topic=a00261 

http://www.wikihow.com/Sit-at-a-Computer

One may feel that proper sitting at a computer is just common sense, however, many of us artists, who work day to day for years develop repetitive strain injuries. These injuries are painful, make working more difficult, and over time can result in surgery.  So, try and nip it in the butt before it becomes a problem by sitting properly, exercising, and stretching because being an artist is already hard enough don't complicate it with pain.