Boston Globe 1/9/08:  Health clubs take on flabby economy: discounts aim to keep old, draw new members.  This month, Longfellow is offering a new special to prospective members – a free two-week membership, with a hitch. Customers must attend six supervised classes during the two weeks. They pay $25 upfront, and upon completion of the six sessions, which can range from personal training to Zumba, they get the money back, with the club hoping these prospective members will subsequently join up.