<p>A riding device includes one or more cranks (15) rotatably attached to a base (10), a rider support (40) having one or more arms (46) movably engaged onto the cranks (15) for allowing the arms (46) of the rider support (40) to be moved cyclically relative to the base (10) by the cranks (15), and a driving device (20) for driving the crank (15) and the rider support (40) to move cyclically relative to the base (10). The rider support (40) may be moved relative to the base (10) by the rider without the driving device (20). A frame (49) may be attached to the arms (46) and engaged with the cranks (15) for preventing the rider support (40) from being disengaged from the base (10).</p>
