If you live in the South Riding area and want to keep fit while having fun, the Dulles South Multipurpose Center offers ZUMBA classes for 18 & older Tuesday evenings from 7:30-8:30 p.m. Fee: $10. You can register online at www.loudoun.gov/webtrac for activity #105505 or call the center at 571-258-3456 for more details.