Wiktionary
n. A form of aerobics done while in water.
Wikipedia
Water aerobics (waterobics, aquatic fitness, aquafitness, aquafit) is the performance of aerobic exercise in fairly shallow water such as in a swimming pool. Done mostly vertically and without swimming typically in waist deep or deeper water, it is a type of resistance training. Water aerobics is a form of aerobic exercise that requires water-immersed participants. Most water aerobics is in a group fitness class setting with a trained professional teaching for about an hour. The classes focus on aerobic endurance, resistance training, and creating an enjoyable atmosphere with music. Different forms of water aerobics include: aqua Zumba, water yoga, aqua aerobics, and aqua jog.
Usage examples of "water aerobics".
Amy Gruss, graduate of SMU (English/Creative Writing), is a prize-winning poet and a professional scriptwriter, who has been known to teach everything from Renaissance dance to water aerobics and Olympic-grade belching.