According to the Mayo Clinic, an individual weighing between 160 and 240 pounds can burn 400 to 600 calories per hour doing water aerobics. The Mayo Clinic explains that the total number of calories burned depends on body weight and the intensity level at which the exercise is being performed.
According to the Daily Mail, a leading UK newspaper, performing aerobics in water reduces strain on the joints and increases the intensity of the workout. Aerobic exercise in water is more intense than aerobic exercise on land because the water creates added resistance. This makes water aerobics effective for both losing weight and gaining strength.