Sanus homo, qui et bene valet et suae spontis est, nullis obligare se legibus debet, ac neque medico neque iatroalipta egere. hunc oportet varium habere vitae genus: modo ruri esse, modo in urbe, saepiusque in agro; navigare, venari, quiescere interdum, sed frequentius se exercere; siquidem ignavia corpus hebetat, labor firmat, illa maturam senectutem, hic longam adulescentiam reddit.
(Celsus, De Medicina 1.1)
A man in health, who is both vigorous and his own master, should be under no obligatory rules, and have no need, either for a medical attendant, or for a rubber and anointer. His kind of life should afford him variety; he should be now in the country, now in town, and more often about the farm; he should sail, hunt, rest sometimes, but more often take exercise; for whilst inaction weakens the body, work strengthens it; the former brings on premature old age, the latter prolongs youth. (tr. Walter George Spencer)