A resilient exercising ball is confined within a frame which defines a space around the ball so that the ball has limited universal movement. The ball may be normally centered within the frame by elastic cords having end portions attached to the frame or by a bottom panel attached to the frame. The ball stretches the cords until the ball contacts a floor surface or a flexible bottom panel connected to the frame, and the ball rolls horizontally within the space in response to movement of the person's body. The frame may be in the form of rigid tubular sections forming arm rests or in a circular configuration with a flexible ball support pad connected to the frame by elastic cords. The frame may also have a V-shaped configuration or may have tubular sections connected by socket couplings or by interfitting end portions.