Abstract: A system is provided for persons who must remain seated for extended periods of time, such as persons working in offices and the like. The system includes one or two support surfaces for the feet of the user, which are moved by a motor driven base. The support surfaces perform an alternating longitudinal movement, a lifting and lowering movement or a movement combining the two movements. The support surfaces are moved by, in one example, support rods hingedly connected to a central point of the support surfaces and at the other end to eccentric pivots allocated to respective toothed wheels which are mounted so at to rotate about their respective axis. An intermediate motor-driven pinion conveys rotational movement in the opposite direction to the wheels and are placed between the wheels. The support surfaces may be a bar that is transverse relative to the motor-driven base, which is preferably used in mass transit vehicles such as motor coaches, airplanes, etc.