I have internally rotated humeri.
I believe that when a muscle is stretched it is weak and inactive. Like the glutes and hamstrings in a bad case of anterior pelvic tilt. Am I correct?
I assume because I have internally rotated humeri I have hyperactive pectorals. Am I correct?
The fact that I have hyperactive pecs leads me to believe that my rear delts are in a stretched state and mostly inactive during horizontal pulling movements.
I feel that if I stretch the pectorals for 2 minutes a side and then do bat wings right after that I will see noticeable change in my rear delts and possibly my posture.