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PHYSICAL FITNESS

JAMA. 1961;176(12):1030-1031. doi:10.1001/jama.1961.03040250056015.
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The current concern about the state of physical fitness, or ability to perform sustained physical work, of the American youth is not entirely a matter of national pride, for it is becoming increasingly clear that physical fitness is an inseparable part of total health. It is well established that physical conditioning causes increased power, efficiency, and endurance of the skeletal muscle; increases the vascularization of muscle tissue; and increases the over-all metabolically active body mass. The total blood flow is increased by the greater cardiac output, and there is increased efficiency of lung ventilation. This means that the usual types of daily activity can be carried out with less fatigue, so that the fit man may return to his family less tired at the end of the day, and can devote himself with greater vigor to his family, which in all probability makes the children happier and the wife more

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