The Young Men's Christian Association ("YMCA" or in the USA "the Y") is a worldwide movement of more than 45 million members from 124 national federations affiliated through the World Alliance of YMCAs. Founded on June 6, 1844 in London, England by George Williams, the goal of the organization was putting Christian principles into practice, achieved by developing "a healthy spirit, mind, and body." The YMCA is a federated organization made up of local and national organizations in voluntary association. Today, YMCAs are open to all, regardless of faith, social class, age, or gender. The World Alliance of YMCAs is headquartered in Geneva, Switzerland.