YES!
check out X Factor Fitness www.xfactor4fitness.com
They offer classes through Arlington County parks & rec. Mostly at Barcroft and Walter Reed.
They also offer pay-as-you-go through Alexandria. I go to Charles Barrett (just on the other side of 395, off S. Glebe) on Monday nights. You can purchase the whole session or a set of 10 classes or a set of 5 classes.