If I'm correct your answer for skills would be agility, co-ordination, speed and I don't know about any others. For health it would be muscle strength and endurance, flexibility, and body composition. The reason for this would be that in water Aerobics, your body is constantly moving with high impact movements. These movements will begin to speed up the more you practice and your agility will go up. Working with others during this would add co-ordination with one another. The water is putting pressure around your body and with these movements, your muscles would begin to tear and strengthen, along with as long as you can preform these movements, it would be adding muscle endurance as well. The flexibility is from it loosening your joints. Body composition will begin to change as well, meaning you may lose quite a bit of weight during this due to it burning a lot of calories.
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