Abstract: A rotatable seat for preventing falling backwards is revealed. The rotatable seat includes a seat member, a base member and a safety member for preventing users from falling backwards. Users can work out by keeping their bodies balanced or shaking their buttocks, like horseback riding while sitting on a saddle-shaped surface of the seat member. Before the users sitting on the seat member, a pommel portion of the seat member is inclined forwards, attached to and positioned on at least one support portion of the base member, unable to be moved freely due to attraction between at least one first magnet and at least one second magnet of the safety member for preventing users from falling backwards. Thus the user's backside can cross over the pommel portion easily to sit on the seat member more safely while using the rotatable seat.

Abstract: A seat for hip shaking is set on a surface of a chair while in use. The seat for hip shaking includes a seat member and a base member arranged under the seat member. A top surface of the seat member is disposed with a saddle-shaped seat surface for users to sit thereon while a spherical surface is projecting downward from a bottom surface of the seat member. The base member has at least one support part on a top surface thereof. The spherical surface of the seat member is moveably supported by the support part of the base member and is rotated at an arbitrary angle. When a user sits on the saddle-shaped seat surface, he/she shakes the hip or maintains the balance to get the benefits of exercise like horse riding.