Hello Margo Myer,
I hope the following link helps. You also want to make sure what the rates are in your area.
NAPS 2 B Fit
You want to look at Glassdoor or sites such as those that have quotes from former employees. Margo your experience is great, but it is also about location and what companies are willing to pay. In 2016 Interactive Health offered $65000 for a National Fitness Director. Manager would be less probably around $55000-58.