Dr. Mosher thinks that standing continually with the weight on the left foot is more injurious than bearing it on the right foot, for it causes the uterus and ovaries to press upon the rectum and so produces a mechanical constipation, especially during menstruation.
Wrong habits of sitting will produce the same results. If the girl sits at school with one elbow on the desk, the head will be turned to the opposite side and the spine will be inclined from the perpendicular, and a lateral curvature be likely to result. If she carries her books always on the same side, it will tend to increase the curvature. If she sits with both elbows supported, her shoulders will be pushed up. If her body is twisted as she sits, a strain comes upon the muscles, and some ligaments will be lengthened and others shortened, thus producing a lateral curvature.
To sit "on the small of the back," that is, slipping down in the chair, bracing the shoulders against the chair-back, tends to injure the nerves by pressure, and also to create a posterior curvature of the spine.
Does it not seem unfortunate that we should allow ourselves even to form such wrong habits of sitting and standing? And now we ask, How shall we know when we are in a correct attitude?
We have comparatively few correct examples to imitate. I notice people everywhere, and I see that old and young stand incorrectly. The head is poked forward, the shoulders are rounded, the chest is flattened, and the curve in the lower part of the back is straightened. The whole figure is out of balance, and therefore not harmonious. Not only is the beauty of the figure destroyed, but the internal organs are displaced. Many a mother who sees her daughter thus growing round-shouldered keeps telling her to throw her shoulders back; but to follow this command only increases the difficulty. The shoulders are not primarily at fault, but the trouble originates in non-use of the front waist muscles. These muscles, weakened by disease because of tight clothing and corset steels, and also by cramped positions in school or at work, refuse to hold the body erect, and it "lops" just at this point. This "lopping" disturbs the harmonious relation of the weights of shoulders, abdomen, head, and the large lower gluteal muscles with which nature has cushioned the lower part of the body, and so they are obliged to readjust themselves to balance each other, and the awkward, ungainly, unhealthful posture results.
What is needed is to restore the right relation of these weights and all will again be harmonious. Do not interfere with the shoulders, but straighten the front of the body by elevating the chest and raising the head until it is supported directly on the spine, letting the shoulders take care of themselves. If the abdomen is now held back and the gluteal muscles raised, the beautiful curves of the spine will be restored, the shoulders will be straightened, and the internal organs will have a chance to resume their natural position.
A very easy way of finding out if you have the correct attitude is to place your toes against the bottom of the door. Now bring your chest up to touch the door, and throw the lower part of the spine backward so that there will be a space between the abdomen and the door. Place the head erect, with the chin drawn in towards the neck, and you will have very nearly the correct attitude. It may seem a little tiresome at first, because you will be apt to hold yourself in position with needless tension of muscles, but you will soon learn to relax the unnecessary tension, and then you will find the position the most comfortable possible. You can walk farther without fatigue, and stand longer without backache, because the body is placed in the attitude in which all parts occupy their designed relation to each other.
One very important fact is that in the wrong attitude the abdominal organs crowd down into the pelvis, while in the correct position they are supported and kept from sagging, so that the matter of a correct attitude is not only a matter of beauty, but also of health.
In sitting, also, the most comfortable posture is the most healthful; that is, with the body squarely placed on the seat, and equally supported upon the pelvis—not leaning back against the chair, unless the chair should chance to be so constructed that it supports the lower part of the back and keeps the body erect.