Click on The Items Below for More Information About Each Class. Water Aerobics classes at the LJCC are designed with everyone in mind. Great for all ages and fitness levels! Water aerobics exercises force the body to continuously move to keep its balance and your head above water. Moving in water engages more muscle fibers because of the water's consistent resistance. This helps shape and tone your body, as well as keep your heart rate up. Water exercises also develop cardiovascular endurance and help work your muscles without punishing joints and bones.