I'm amazed that some people never heard of RSI. Maybe that it's known by other names in your countries.
As N30 said, leave the computer for ten minutes at the time... I should have to program a black out for that because otherwise I wouldn't be able to walk away from it.
As for you PENAF:
Computer Related Repetitive Strain Injury.
What are the Symptoms?
Tightness, discomfort, stiffness, soreness or burning in the hands, wrists, fingers, forearms, or elbows
Tingling, coldness, or numbness in the hands
Clumsiness or loss of strength and coordination in the hands
Pain that wakes you up at night
Feeling a need to massage your hands, wrists, and arms
Pain in the upper back, shoulders, or neck associated with using the computer.
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