The unique design of the lifespan® desk bike have a great advantage over fixed bike arrangements. Unlike most stationary bikes, these unit allows variable resistance control (using computer) to accomodate an individual's natural pedal movements. Also, its optional pedal arm attachment provides the option of pedalling in a forward pedalling motion without converting to a less than ideal fixed bike arrangement. These product are aimed at a healthy life-style user who will achieve both fitness and strength benefits while working at their computer.