In addition to cardiovascular benefits, using an exercise bike provides an excellent, low-impact lower-body and abdominal-muscle workout. Two primary types of exercise bikes exist — upright and recumbent — with each delivering slightly different results. This is due to the fact that the upright bike forces an individual to sit straight up and pedal — much like an outdoor bicycle — while the recumbent bike allows the exerciser to lean back comfortably while pedaling.