SEAN O'BRIEN, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY SEAN O'BRIEN, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Water aerobics. Elderly people taking part in a water aerobics class. They are being instructed in stretching exercises by an aerobics instructor (lower left) in a swimming pool. Stretching exercises can help warm up joints and muscles, improving stamina and muscle tone, and reducing the risk of injuries. They can also help improve joint mobility and strength in elderly people suffering from arthritis.
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