aerobics

[ai-roh-biks]
noun
1.
Also called aerobic exercises. (used with a plural verb) any of various sustained exercises, as jogging, rowing, swimming, or cycling, that stimulate and strengthen the heart and lungs, thereby improving the body's utilization of oxygen.
2.
(used with a singular verb) a physical fitness program based on such exercises: Aerobics is a good way to get your body in shape.

Origin:
1965–70; see aerobic, -ics; probably shortened from aerobic exercises on the model of calisthenics

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World English Dictionary
aerobics (ɛəˈrəʊbɪks)
 
n
(functioning as singular) any system of sustained exercises designed to increase the amount of oxygen in the blood and strengthen the heart and lungs
 
aer'obicist
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

aerobics
method of exercise and a fad in early 1980s, Amer.Eng., coined 1968 by Kenneth H. Cooper, U.S. physician, from aerobic (also see -ics) on the notion of activities which require modest oxygen intake and thus can be maintained.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

aerobics aer·o·bics (â-rō'bĭks)
n.

  1. A system of physical conditioning to enhance circulatory and respiratory efficiency that involves vigorous, sustained exercise, such as jogging, swimming, or cycling, thereby improving the body's use of oxygen.

  2. A program of physical fitness that involves such exercise.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary
aerobics [(air-oh-biks)]

Exercise designed specifically to improve cardiovascular fitness and, subsequently, the body's use of oxygen. Also called aerobic exercise.

Note: The term aerobics usually refers to a specific kind of vigorous exercise, sometimes involving dance steps, that is set to music. Other forms of aerobic exercise include running, cycling, and swimming.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Participate in elephant aerobics and giraffe feeding.
We examine five claims about the supposed benefits of weight lifting and
  aerobics to see which carry the most weight.
These fractures are caused by overuse during strenuous exercise, particularly
  jogging and high-impact aerobics.
The routine continues with low-impact aerobics and exercises to promote
  flexibility.
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