Where do I post open spots for independent personal trainers who want to rent gym space?

I own a gym in Lakewood, CO and am looking to rent space to independant personal trainers. I have no idea where to post such an opportunity. I know I will have no problem once the opportunity is in front of them, since I know I am offering space for (comparatively with other gyms) the lowest rent in the area.

Any ideas on where to post would be helpful. I already tried Indeed.com and had my post removed. They said it wasn’t a “job”.

Thanks in advance!