Originally Posted By travlin'easy
First and foremost, from a medical point of view, I seriously doubt that you are strengthening your finger muscles by using weighted keys, synth of piano makes absolutely no difference. The movements while playing do not flex those muscles very much at all.
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We're not talking about an actual muscle in that sense. We're not saying a pianist fingers have BIGGER muscles in a sense that they can punch harder or have more horse power to lift heavier things or any thing like that at all. That would be a very odd thing to say!