One other option, within Facebook, is to reach out to groups (other than your own FB page if you have one). For example, I do some work community work with a local early childhood PTA and have met many moms who are eager to start a new fitness program.
There are also local FB home groups for selling items (may be invite only–but you can find someone who will invite you to become a member of the group). Some of them allow business owners to advertise once or twice a week. Just a thought, because you may get some new participants that way by posting your schedule.