you are able to find the various fitness meetup groups available in the Indianapolis area. An example of the one of the groups is found below:
https://www.meetup.com/Zionsville-Over-50-Walking-Talking-Meetup/about/comments/?op=all
The groups are open, without fees to join, and generally advertise if there is any cost to the activities posted. This is a casual way to introduce yourself to like-minded folks who have an interest in and are actively pursuing fitness goals like yours.