I've also got repetitive strain injury in my wrists and fingers, and I finally started going to the gym recently to try to help with that. I haven't found cognitive improvement, but it's pretty much fixed the RSI in a quite counter-intuitive way. I hadn't heard of the effects on the brain - hopefully it helps me with that as well.

I haven't been going long enough for any physical deterrent effect, but hopefully that will come in time. I'm not (rationally) concerned about my physical safety, as the vast majority of the bullies did not get the grades required to stay for A levels and I've got a good group of friends around me.

Thank you!