workout (n.)youdaoicibaDictYouDict[workout 词源字典]
1909, "boxing bout for training," from work (v.) + out (adv.). General sense of "spell of strenuous physical exercise" is attested by 1922. Verbal phrase work out "solve" (a problem, etc.) is from 1848. Sense of "succeed" attested by 1909.[workout etymology, workout origin, 英语词源]