An input device includes a body having a generally hemispherical shape including a flat side and a curved side opposite the flat side, a foot pad on the flat side of the body, the foot pad including a foot rest position for receiving a foot of a user, a load sensor configured to detect pressure applied to the foot pad by the foot of a user, an accelerometer in the body configured to detect angular motion of the body in response to the pressure applied to the foot pad, and an output circuit coupled to the pressure sensor and to the accelerometer and configured to output data generated by the pressure sensor and the accelerometer.