Progressive Resistance Exercise Putty
The resistance of the putty to squeezing is increased by kneading bits of the dark blue material into the large piece of putty. Makes putty stiffer as your grip becomes stronger.
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Progressive Resistance Exercise PuttyThe resistance of the putty to squeezing is increased by kneading bits of the dark blue material into the large piece of putty. Makes putty stiffer as your grip becomes stronger. |
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