A strict plan or routine, usually involving diet, exercise, or medical treatment, designed to improve health or achieve a goal.
From Latin 'regimen' (government, rule, guidance), derived from 'regere' (to rule, direct). Originally used to describe rules for living a healthy life in medieval medicine.
Medieval doctors prescribed 'regimens' that included detailed rules about air quality, diet, sleep, and exercise—basically the original 'wellness plans'—and interestingly, much of their advice holds up today.
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