person A: I've been taking care of my aging mom for 5 years now and don't really have any friends_comma_ since so much time is used taking care of her.
person B: That is a nice thing you are doing for her though. Maybe you could hire somebody for a few hours a week and join a gym or yoga class. 
person A: Thank you. Can't afford outside help unfortunatley. Yes. I have picked up exercising though.
person B: Go to a walking path or park. Maybe to a dog park also. 