The Leventhal-Sidman Jewish Community Center (333 Nahanton Street) in Newton will hold a fitness center open house on Sunday, January 6 from 8am-noon. The event includes free demonstrations in the Pilates Studio, JCC personal trainers available to discuss fitness needs, information about the JCC’s Take It Off weight loss program, free nutrition bar samples and music. Community members can sample group fitness classes such as Zumba, spinning, cardio blast, yogalates, JBarre and turbo kick. A special Family Zumba class will be offered from 11-11:45am. The event is free and open to all. Call 617-558-6411 for details.