Today I was laying on my right side propped up and using my right arm to type a long email to a froend. When i stopped writing the muscle on my right ribcage felt as though it was really tight and almost pulling. My right arm was also aching. It kind of scared me as this is a very stange sensation . I was wondering if maybe the way I was propped and my right side being curved in an maybe from being in a weird postion could be the problem? I tried to exercise it out but it still feels tightly strung across my ribs although to the touch its pretty loose. Anyone else get this? Maybe from typing in the wrong position?