WHY USE SHOES?
Whatever the activity, the majority of exercises are performed with the feet in contact with the ground, which is sometimes abrasive, or with a surface to which you will apply your foot (step aerobics, cycling, trampolining, etc.).
Using shoes helps to reduce friction between the foot and these surfaces.
WHY DO AQUAFITNESS OR AQUA AEROBICS?
Once immersed in the water, the body becomes lighter and all movements become easier, even though the water creates more resistance than air and makes muscles work harder. Your muscles get a more intense workout without you even noticing. Aquafitness also has the added benefit of being a "low-impact" activity.
So what are you waiting for? It's good for your body, your heart, your health and your mood!