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General physical health and strength is beneficial to working at your potential for anything. But unless you're recovering from an injury and/or you have abnormal weakness in your arms and wrists(?), that's not going to do anything but probably 'warm you up' at that moment - which will probably help you to play faster and more accurately at that moment. (Those finger exercisers and squeezing a ball do the same thing - they warm you up.)
Scales and arpeggios blah, blah, blah ... PRACTICE!
There's really nothing like guitar playing to make your wrists and forearms strong.
*Look at all those skinny little rocker dudes that shred ala Randy Rhoads.
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