The first thing that comes to mind is a powerball, as it's designed for that purpose. On the other hand, David at Harrowdrive has other thoughts on them, which can be read here (just trying to give you both sides of the story).
I have a Powerball at home, and I find it brilliant for this sort of thing. I don't overdo it, as I don't particularly fancy getting RSI or similar, but as a quick exercise to do for a couple of minutes every day, even while sitting and browsing the net or similar, it's excellent.
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