. A civic biology : presented in problems. Biology; Sanitation. THE HUMAN MACHINE 269 is an example of a good habit, round shoulders a bad habit of this sort. The habit of a wrong position of bones and muscles once formed is very hard to correct. This can best be done by certain corrective exercises at home or in the gymnasium. Round shoulders is most com- mon among people whose occu- pation causes them to stoop. Drawing, writing, and a wrong position when at one's desk are among the causes. Exercises which strengthen the back muscles and cause the head to be kept erect are helpful in form- in
. A civic biology : presented in problems. Biology; Sanitation. THE HUMAN MACHINE 269 is an example of a good habit, round shoulders a bad habit of this sort. The habit of a wrong position of bones and muscles once formed is very hard to correct. This can best be done by certain corrective exercises at home or in the gymnasium. Round shoulders is most com- mon among people whose occu- pation causes them to stoop. Drawing, writing, and a wrong position when at one's desk are among the causes. Exercises which strengthen the back muscles and cause the head to be kept erect are helpful in form- ing the habit of erect carriage. Slight curvature of the spine either backward or forward is helped most by exercises which Diagram showing action of biceps muscle, tend tO Straighten the body, a* contracted; b, extended; h, humerus; «S. SCclpllltl. such as stretching up with the hands above the head. Lateral curvature of the spine, too often caused by a " hunched-up ' position at the school desk, may also. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunter, George W. (George William), 1873-1948. New York : American Book Company
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