Functionally they both do. The dominant power muscles of the shoulders (Pecs and Lats) both internally rotate and adduct the humerus bone which subsequently pulls the scapula forward as it has no true articulation at the back. It's a path of least resistance thing.
I've been trying to fix the issue on myself, the advice I got from the physio agrees with what koalapie said above. My strategy is to stretch the pecs and lats most days and also doing seated cable rows.
> Right, so either imbalance makes your shoulders go forward?
Correct. That's why it's useful to do stretching of pecs and lats as suggested above. Also strengthening the scapula retractors and depressors and the rotor cuff.
Nah - On occasion I can hold a pretty perfect free-standing handstand for well over 10s, and I didn't start doing them until my mid 30s. Mannas are harder but you can work through easier progressions (see the Gymnastic Bodies website).
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