Hello Amy Wiggins,
I would describe what you mean by functional training and how you are able to help. Age is not a deciding factor and many if not all people have some sort of imbalance to work on daily. Just become friends with your fellow parishioners and they will get to know you through small talk. Then the ones who work with you will feel better and hopefully get the word out about how you help. I would not push the business side of things from the start. People need to feel comfortable around you first.
Natalie aka NAPS 2 B Fit.