Are you going to play righty and lefty?
Even if playing bass did that, you would really only be working out one arm. I can't think of any other instrument besides a stringed one that would target that specific muscle...
Besides who cares about forearms? Unless you want those veins poppin out or something...I can't say I've ever met anyone thoroughly impressed by a solid forearm.
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Confusion will be my epitaph...
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