Stay active all year round with Water Aerobics at our Rock Prairie location. Martha Hirsch offers water aerobics classes in our heated saltwater lap pool twice a week, weather permitting. Water exercises have been known to help put less stress on the joints, as well as act as a form of resistance to help increase flexibility and balance. Each class session is $10 per guest, or a series punch card valid for 9 classes can be purchased for $80.