Based on: The Diagnosis and Treatment of Postural Defects. By Winthrop Morgan Phelps, B.S., M.D., F.A.C.S., Professor of Orthopedic Surgery, Yale University, etc ...

As phys-ed director, Bancroft found that over half of New York City’s public school children suffered from poor posture. She made this discovery using her rudimentary vertical-line test, which ...