The Nordic Track GX3.0 exercise bike is equipped with a smooth, frictionless, computer controlled magnetic resistance system with a 10kg (22lbs) flywheel & 10 levels of resistance to let you adjust the workout intensity so that it precisely meets your requirements. Apart from displaying the workout data, the LCD console of the Nordic Track GX3.0 bike offers a choice of 18 workout programmes that can be further expanded if you purchase i Fit workout SD cards (sold separately). The integrated Intermix Acoustics audio system with speakers & audio jack enables you to exercise to your favourite music. The bike provides easy heart rate readout with the use of hand pulse sensors, & to make sure maximum accuracy has been achieved, you can also use a wireless Polar compatible receiver integrated in the console (chest strap not included).