Abstract: An audio-visual device for exercising machines including a picture projector fixed on the machine at such a position that the pictures or images can be seen by the user; and optionally, a sound system built in the projector; a picture feeding device, a current tap for supplying electrical energy to the projector; the picture feeding device, and the sound system, if present; a device for sensing the speed of the machine, applied to a moving member of the machine and transmitting the energy produced by the motion of the moving member to the picture feeding device; wherein a changeover switch is provided for connecting, as desired, the picture feeding device either to an electrical energy source or to the device sensing the speed of the exercising machine.