For decades, the idea of standing properly upright carried considerable political and social baggage. Slouching was considered a sign of decay.

In the early 20th century, posture exams became mainstays in the military, the workplace and schools, thanks in part to the American Posture League, a group of physicians, educators and health officials that formed in 1914. In 1917, a study found that roughly 80 percent of Harvard’s freshman class had poor posture. Industrialists piled on with posture-enhancing chairs, products and gadgets.