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by sonnekki 5542 days ago
A good parallel to typing is playing classical piano, where the hands are lifted, and a straight line can be projected through the wrist to the elbow.

Resting the wrist or elbow on some sort of extension is what causes the strain. The trick is building the strength to hold up your hands and arms (maybe take up piano ;) ) without becoming tense in your shoulders and back. All of this follows from having a good posture.