Is there such a thing? Well, we are humans, right? Er, we'd like to think so...
For 14 years I've been exercising my hands. It all started out when I worked at a trampoline factory. The supervisor taught us these to help strengthen our hands and prevent carpal tunnel.
1. Hold your arms out in front of you (horizontally) with palms up. Then, rotate them until your palms face down. Then up again. Down. About 10 times.
2. Spread your hands in front of you, like you're getting ready to push someone. Squeeze them shut. Open. Shut. 10 times.
3. Next, rotate your hands at your wrists into an outward circle. Then inward. 10 times each.
4. Hold your hands in a 'prayer' position below your chin, and slowly bend them to the left so that your left hand is pressed by your right hand into a 90 degree angle. Hold for 10 seconds. Do this for the other hand so that your right hand is being pressed into a 90 degree angle.
I can type and draw for hours without cramps or aches!
What exercises do you do for your writing? You can mention the kind that strengthens your grammar, too! ;)