I have to admit I was hit my a car when I was 3 I was then diagnosed with brain damamge.I overcame so much in my life and now I play guitar.My picking hand's dexterity isnt the greatest, as it was the right side of my body that was affected....what exercises could I do to strength that hand and get more control over it?
As far as getting better at playing the guitar is concerned the best exercise for that is playing the guitar. There's not really a lot of strength required, it's more a case of control and dexterity and that comes with time and practice.

If you're asking in more general terms then that's arguably a question for a qualified physiotherapist.
Actually called Mark!

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