history: I've been taking care of my aging mom for 5 years now and don't really have any friends, since so much time is used taking care of her. 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.
current: 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. 
next: Thank you. Can't afford outside help unfortunatley. Yes. I have picked up exercising though.