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Bad posture as in lordosis or kyphosis (slouching shoulders or arching lower back). For rounding, they have to do with the erector spinae muscle group that run up and down at the spine. Your imbalance could be the pectoralis minor is very tight and is pulling the shoulders forward. The rhomboids work would help that.
To determine the issue. Lay on your back with knees together and bent. Slowly let the knees lower to the left (without taking your shoulder blades off the ground). Starting with your right hand facing palm up at your right hip. Keep your arm straight and elbow on the ground. Slowly slide the arm from the hip towards your head (keeping the shoulders on the ground). If you can not point the tips of your fingers to 12 o'clock then your pec minors may be pulling your posture out.
You will need to pull the antagonist and protagonist (opposing muscle groups) back in balance. First step is to loosed the tight one.
Supermen on a stability ball with the arms our front, and in a V. Also reverse flies may hit the rhomboids.
Hope this makes sense. It is unfortunately common.
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