The Alexander Technique, named after its developer Frederick Matthias Alexander (1869–1955), is a type of alternative therapy based on the idea that poor posture gives rise to a range of health problems. The American National Center for Complementary and Integrative Health classifies it as a "psychological and physical" complementary approach to health when used "together with" mainstream methods. When used "in place of" conventional medicine, it's considered "alternative".
Alexander began developing his technique's principles in the 1890s in an attempt to address his own voice loss during public speaking. He credited his method with allowing him to pursue his passion for performing Shakespearean recitations.
Proponents and teachers of the Alexander Technique believe the technique can address a variety of health conditions, but there is a lack of research to support the claims.