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Repetitive strain injury, Occupational overuse syndrome, and Carpal tunnel syndrome are all faces of the same malaise. For those on the coal face of the IT industry, it's endemic, and can mean losing a career when typing becomes too painful to sustain. It
Every 10 minutes (or whatever you set it to) the program will play a sound to remind you to have a stretch. I use a large archive of sound bites from movies and TV that I found on the web - the program picks one at random as the reminder each time to keep it interesting.
The important thing is that this is not intrusive, it does not slow me down, and it works. I resent those programs that measure how much you have moved your mouse, or used your keyboard. All that expends resources that my PC and I could better use elsewhere. SoundBreak just sleeps until it is needed.