The Gymnasticon was an early exercise machine resembling a stationary bicycle, invented in 1796 by Francis Lowndes. Its function was to exercise the joints, either "in all parts of the body at once, or partially."[1]
^"Gymnasticon," J. M. Good, O. Gregory, and N. Bosworth, Pantologia. A New (Cabinet) Cyclopaedia (London, 1819); Google Books scan.