Etymology
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workout (n.)

1909, "boxing bout for training," from work (v.) + out (adv.). General sense of "spell of strenuous physical exercise" is attested by 1922.

updated on June 08, 2019

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Definitions of workout from WordNet

workout (n.)
the activity of exerting your muscles in various ways to keep fit;
Synonyms: exercise / exercising / physical exercise / physical exertion
From wordnet.princeton.edu, not affiliated with etymonline.