Sessions of physical exercise or training to improve fitness, health, or athletic performance.
'Work' comes from Old English 'weorc' (effort, task), and 'out' was added in the 1890s-1900s as exercise became a specialized concept. 'Work-out' originally meant 'to work out a problem' before being applied to physical exertion.
The term 'workout' is pretty modern—before the 20th century, people didn't 'work out,' they just did physical labor, sports, or calisthenics; it's a distinctly industrial-age term born when work became something you did in a gym rather than all day long.
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