George Barker Windship (January 13, 1834 – September 12, 1876), sometimes spelled "Winship", was a Boston physician most noted for his promotion of weight lifting as a route to health and strength and inventing the first adjustable dumbbell and the forerunners of several modern exercise machines. Windship first introduced Weight Training in the United States between 1859 - 1872. He toured with lecturers and exhibitions. He died 12 September 1876, in Roxbury of a stroke.