Water aerobics: Cost is $2.00 per class or free with a season membership. Water aerobics allows participants to reap the same benefits as out of water aerobics, and then some. Water aerobics allows a person to exercise every muscle and joint in the body all at the same time. Water aerobics causes less strain and stress on joints and muscles, so almost anyone, no matter their age, can participate in water aerobics. Also, water aerobics are cooler for the body, especially in the summertime heat, as the water cools off the body during the entire workout. Pre-registration not required.