Okay sorry wrote that quick and my mistake but this is a historic problem, I am fine now. It was my left shoulder that was weak rather than my arm. Not entirely sure which muscles but definitely in the posterior rather than the arm itself not sure where they are inervated. I had a very stiff segment in the thoracic where my scoliosis curves most but also had some issues with my neck I would say because of the lean to the left. I have been fine for three years now and can ride 100 miles without pain as well as hold time trial position.
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