[IkmoIkmo]

The muscle growth you describe would have the opposite effect. Back muscles help pull the arms and back to the back.

That's just a general rule though. If you hang from your shoulders but let your shoulders go, instead of pulling them back (which builds back muscles), I can imagine a slouched look developing. But if you pull back your shoulders it'll have the opposite effect, building muscle that improves your form.

I guess at the end of the day you have to focus on the sport you love, and do correcting exercises to keep your body in balance on the side. Most sports have lots of repetition on key moves and they lead to all kinds of issues, so I'd argue this is true for any sport.