<p>An exercise aiding apparatus has: a step (2) on which user's foot can be placed; a step driving means (5) for causing the step (2) to move, and causing thereby the foot placed on the step to exercise; and a motion allowable zone modifying means for expanding a motion allowable range of the steps (2) established by the step driving means in accordance with a load acting on the step (2). The motion allowable range of the step (2) is expanded when the user intentionally increases the load acting on the step (2).</p>
