As a follow up to my last post about how to make a fist, I found a great article on GrappleArts.com about improving grip strength. Included are step-by-step exercises with photos for increasing wrist, thumb and finger strength. While most of the exercises do require some sort of equipment, it ranges from a bag of sand to run of the mill free weights, and nothing looks very difficult or expensive to obtain. The article is written by Rick Walker, who seems to have a good... grip... on the subject. 
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