Here is a bit of fitness info that might be of interest. This is from Michael Scott Scudder on group fitness classes.
First, establish your Maximum Room Capacity:
Square Footage of your exercise room less 100 Divide that number by 35
This number is your maximum number of participants per class
Example: 1500 square foot exercise room (1500 - 100 = 1400/35 = 40 - your MRC)
Next, recognize that if you do not have at least 30% of your MRC in attendance in a class;
you should either change instructors, change the class or cancel it outright! (In the above example, a "breakeven class" is no less than 12 attendees.)
