This book provides information about how poor posture moves the head and shoulders forward and places pressure on the chest and abdomen to cause a wide variety of health problems, and how to prevent and treat them. One of the many effects is compression of the lungs which impairs the efficiency of breathing. Similar problems affected nineteenth century women whose lungs were compressed by their tightly laced corsets. They were prone to breathlessness and faintness, and were easily exhausted. In order to explain those effects more clearly the book includes about 300 illustrations, many of which show what is happening to the internal anatomy which is otherwise hidden behind a layer of skin. There are also 180 references, and over 1000 pages, and an alphabetical index to 2400 subjects.