DD is a pitcher...at around 12 yrs old school nurse did their regular scoliosis check and advised us of a small curve in DDs spine, DR told us at the time that it COULD be due to her pitching...her right shoulder muscles had developed much faster than her left, causing the spine to bend (curve), twards the more developed side. We were proactive in the matter and quickly with the DRs advise did some PT on our own. DD did weight curls with the left side, started carrying all of her equipment on the left, etc, etc....with such a small curve, it was not difficult to straighten her out
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Now that DD is 16, she does workout with a very informed HS track & field coach, who specializes in female throwing athletes. He reminds her that for every positive there has to be a negative (that's not the term he uses, but you get the point), every workout must be balanced to keep yourself balanced as well as fit.
Now this is just one example, and I would advise anyone to speak to their DR and be honest with them about your DDs physical activity. We avoided surgery & braces, just by being aware of the degree of curve and curcumstances, most importantly DD was aware of what she could do to help make it better (she still carries her equipment bag on the left ;D).
BTW scoliosis was only mentioned by the school nurse, not the DR.