All good answers. To me the best answer is “it depends.” It depends on experience (teaching these classes), education, certification, and, most important, the agreement you negotiated with your facility when you began teaching the continuing ed classes. As you gain more experience in teaching the classes, I suspect that you’ll be in a position to receive greater compensation.
I’m curious about how you packaged your education and what you charged for it.
I recently did a 2-hour training for fit pros, without CECs, for $40 per person. It sold well, even without the CECs. It wasn’t a certification, just a “Get to know this piece of equipment so you can add it to your toolbox,” sort of event.
If I had had offered CECs, since getting the CEC permission from ACE is a few hundred dollars, I would have charged another $10 – $15 per person. I notice another person said $15 per contact hour. I think that works in a longer context (my 200 hour yoga training cost about that), or in a situation where you’re opening the training to a big group, but for short trainings or small trainings, the least I’ve paid much more for the small environment, so I charged more. It worked well.