"One thing I have noticed is that my left arm gets tired after cranking in a few fish"
uh oh.. gonna have ta call you la-wimp-ski again....
Seriously though; I have to carry a convench and spinning set up if I'll be casting more than a couple of hours straight, my shoulders are shot and the slight difference in casting motion lets me fish longer... by October last year getting up from a push-up position pain free was out of the question... still fished till Dec.. took a month for them to recover.... hopefully stricter exersize regimines this winter helped that a bit...