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How to do water aerobics
Get a chlorine resistant bathing suit.
Water aerobic classes are usually about an hour, so you want to make sure you have a suit that can deal with hour long classes a few times a week.
You can wear a one or a two-piece suit, but a one piece is probably more comfortable.
Some gyms might require that you wear a one piece. If you're taking water aerobic classes at a gym, make sure you find out.