each time the breath is drawn in. Thus the secures a large supply of fresh air.
To stand or sit with a hunched back not only spoils one's appearance but also make it impossible for the lungs to expand fully. As a result, the body does not secure a sufficient supply of air, which in time impairs health and renders the body susceptible to diseases like colds and tuberculosis.
People who work indoors, especially those whose work requires them to sit down while they work, should make it a practice to stand erect several times a day and take several deep breaths in order to fill all the air sacs with fresh air, thus keeping themselves in a good condition.
