I've been having issues flexing on one side. When I go to flex my left side it is fine my shoulder blade goes back and the upper trap muscle comes up. However on the right side my shoulder blade won't budge the upper trap flexes slightly but no where near as much as the left. It doesn't affect my shrugs, rows, or shoulder work outs but I feel limited on flat bench. I am seeing a trigger point therapist in the morning to see if he can help with the situation. Has anyone else had this issue?