If you are, like me, working almost 10 hours a day with your Mac, you’re repeating the same hand movements over and over again. If you’re susceptible to RSI (repetitive strain injury) try the litte utility AntiRSI. It’s freeware, but the developer welcomes a small donation if you like it.

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You might like to take a look at my Dejal Time Out application, too. It is also free, and perhaps more flexible.
http://www.dejal.com/timeout/
Thanks for the tip, David!