Originally Posted by Beverly McD.
Use a large bowl (like a mixing bowl) and pour in 2 cups or so of rock salt, and 2 cups or so of long grain rice.
Several times per day grab a handful and squeeze as hard as you can for ten seconds or so.
It's great for both grip strength and callouses.
This, Bev beat me to it!
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I can't take too much credit. Learned about this several years ago from BigDamRay Pierce, from Bad Attitude Gym