I use rock climbing tension bands. It works the muscles that open the hand. I use it cause I'm gripping and grabbing heavy ass metal pieces all the time.
Granted my hands were already bigger than average, there is still that muscle between the thumb and pointer finger that you can get some gains on.
Good luck
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Drunk in the club, let a nigga say somethin'...
I'll have him fall victim like the nigga base jumpin',
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