Abstract: A mobile apparatus, especially one for medical exercise and treatment purposes, with a seat for accommodating a person, below which several foot elements, which can be set down on the floor, are movably mounted in each case in a bearing mounting on the seat side of the apparatus, which bearing mounting has at least one first bearing element, which protrudes into the bearing recess and which detachably abuts at least one second bearing element formed at the foot element, so that the foot element, which can be moved essentially vertically and, with that, its floor touch-down surface, in a position, disengaged from the floor, can be swiveled forward in the direction of motion of the toy with engagement of the two bearing elements, the foot element, when the floor touch-down surface touches down on the floor, being movable essentially vertically upwards with disengagement and, at the same time, being guided in the bearing mounting in such a manner that a component of motion in the running direction is imparted by