I really like your idea! They way of getting a better lifestyle for old people through fitness and how this could help both: -Fall prevention -Enhance retirement homes reputation who will become a selling point.
Here in Spain, they have just a few residences who does this in a similar way, they are trying to help creativity thinking trough dynamic exercises/activities.
Best of luck to your project, Let me know if I can help in any way. email@example.com