Fitness/exercise support

I recently came across a charity in Wales that helps people with neurological diseases to take part in health and fitness services.

(Contacting and Visiting us | Neuro Therapy Centre)

I have MS and my aunt has Parkinson’s. It would make a huge difference to our quality of life to access something like this. Are there any charities or services like this in London? I’ve no idea where to start looking.

The only one I am aware of is the excellent Ability Bow, based in east London. They are a charity that supports disabled people with exercise, so might be what you are looking for.
Ability Bow - Disability Gym, East London, UK.