I would suggest starting a small group workout and branch out from there by asking people if they would be interested in doing specific one on one training with you.
Have brochures, flyers, cards at your studio and also pass them out every where you go.
Go to the businesses you frequent often and offer your services to them. This includes your dentist, doctor, hair stylist, etc. Market yourself daily.
Join the Chamber of Commerce or look for business functions in your town.
Attend local events and try to get booths and participate whenever you can.