[The importance of physical culture and toughening for middle-aged persons].
D000368:Aged; D001494:Baths; D006801:Humans; D008875:Middle Aged; D010809:Physical Fitness; D013177:Sports; D013550:Swimming
O znachenii fizicheskoĭ kul'tury i zakalivaniia dlia pozhilykh liudeĭ.