Sydenham recommended horseback riding above all else as a cure for hypochondria and melancholy: But nothing of all I have hitherto known does so much comfort and strengthen the blood and spirits, as riding much on horseback every day for a long while; for, since by this kind of exercise, the lower belly is most strongly mov'd, in which the vessels for excretion (as many as are appointed by nature to drain the impurities of the blood) are situated, what disorder of the functions, or other natural impotence of the organs, can be imagin'd