Our expert says:
Pilates at 13 is fine, no problem. In fact, most things are fine, when done in a controlled and careful way. The instructors and the gym may have other reasons for not wanting children there (you'll probably find that it's a litigation thing, worried about injury and absence of parental supervision and so on because they'll be liable), but from a physical point of view, there's no reason at all that you should not be able to do Pilates. It's not hugely weight bearing, it's not excessive load and it's certainly not dangerous (or that is, more risky than it is for anyone else). So I'd appeal, ask for special permission, or else get off and do some sessions by yourself for those frustrating 9 months. I think you're up against policy here, not physiology.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.