An exercise chair includes a frame and a seat rotatably coupled to the frame. This is accomplished through careful control of the relative shrinkage rates of these various parts. The color space converted image is then low pass filtered and compared to a threshold to remove artifacts and background objects from the candidate object of interest pixels of the color converted image. Also, the apparatus comprises a control entity suitable to establish a tandem-free transfer of data received from the mobile to the remote base station. The damper mechanism includes a vibration absorbing mechanism and at least one actuator that is controllable to affect the torsional vibration absorbing characteristics of the vibration absorbing mechanism. The speech generation device may include a head mounted display unit having a variety of different components that enhance the functionality of the speech generation device.