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My acoustic duo has played 2-3 gigs/month for the last 3 years. We played this past weekend our usual 4 hour / 4 set gig. In the beginning of the 4th set I suddenly look down at my fretting hand ring finger and realize that it's bent flat against my palm and I can't straighten it out! Forearm cramp! I pried it back open and somehow survived to the end of the song and then took a few moments to do some quick massage and work it out, but boy it felt like it could re-trigger at any time. That was not a fun way to finish out the gig!

Anyone else experience this? Any quick remedies? Any prevention advice? I know I'm not a 'death-grip' kind of guy, so maybe I'm too relaxed and have lost muscle tone (I'm 55). Do grip strength exercisers actually work?