The present invention relates to a movement for a timepiece having a retrograde display member displaying at least one time division, comprising a going train, means of driving the display member comprising a wheel unit (8) driven by the going train and carrying a first cam (10) sharing the same axis of rotation (12). The movement also includes a rocker (20) supporting a probe (25) held against the edge of the first cam by deformable elastic means (31, 61) undergoing a deformation of variable amplitude. This results in the application of a corresponding force on the rocker in proportion to the distance between the probe and the axis of rotation (12) of the first cam. The movement also includes drive means (27) to connect the rocker to a retrograde display member (1). More precisely, the movement includes a force-regulating device (30, 50) interposed between the elastic means and the rocker. In one variant the regulating device is in the form of a second, heart-shaped cam (30) coupled in rotation to the rocker and sharing the same axis of rotation (X) as the latter. The elastic means then comprise a long spring (31), one end (34, 35) of which presses against the edge of the second cam so that the application of the force on the rocker takes the form of a torque applied directly by the second cam to its axis of rotation.