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aer·o·bics

aerobics

pronunciation:
eI ro bihks
features:
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part of speech: noun
inflections: aerobics
definition: (used with a sing. or pl. verb) a system of physical conditioning involving sustained and vigorous exercise such as running, swimming, cycling, or dancing, that stimulates the heart and lungs and thereby improves the body's ability to utilize oxygen.
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See
  breathe, exercise, respiration