Charak Samhita
प्रतारयेत् प्रतिस्रोतो नदीं शीतजलां शिवाम् । सरश्च विमलं शीतं स्थिरतोयं पुनः पुनः ॥५९॥
• The patient should be made to swim often against the current of river with cold water but harmless. He may also be advised swimming frequently in a pond having clean, cold and stable water.
english translation
pratArayet pratisroto nadIM zItajalAM zivAm । sarazca vimalaM zItaM sthiratoyaM punaH punaH ॥59॥
hk transliteration by Sanscript