Here are some exercises intended to help prevent carpal tunnel syndrome. Remember doing a quick five minute exercise warm-up before starting work, just as runners stretch before a run, can help prevent work-related injuries. 

Extend and stretch both wrists and fingers acutely as if they are in a hand-stand position. Hold for a count of 5.
Straighten both wrists and relax fingers.
Make a tight fist with both hands.
Then bend both wrists down while keeping the fist. Hold for a count of 5.
Straighten both wrists and relax fingers, for a count of 5.
The exercise should be repeated 10 times. Then let your arms hang loosely at the side and shake them for a few seconds.

 Source: Housang Seradge, MD, et.al., poster exhibit, 1996 Annual Meeting, American Academy of Orthopaedic Surgeons.