Financial Profile of a Pilates Studio?

Hey everyone - my mom has been doing pilates for years and just recently got certified. She is considering opening her own studio and employing several of her friends. She turned to me (the son that went to business school) for some advice about the financial aspects of running a pilates studio and the industry in general. Trouble is, I have absolutely no experience or data, but I want to help my mom.

Can any of the pilates studio owners out there share some basic financial information with me so I have some data points? Please don't feel compelled to share your studio name or anything, but can anyone give me some data points on the following:

Total Annual Revenue
Annual Profit
Number of instructors at your studio

It would be really helpful! Thanks everyone.

Bill