The creation of recumbent bikes (bikes with a chair instead of just a seat) have made this form of exercise an even greater beginning point for those de-conditioned individuals who are just starting out. The seat back provides added comfort and back support. The seat bottom is larger and more comfortable than traditional bike seats. Mounting and dismounting is generally easier and safer than a traditional bike.
The recumbent bike can be even more difficult than an upright cycle to reach your target heart rate due to the supine position but the added comfort allows for longer workouts that can produce better results. In addition the seated position promotes better blood flow at a lower pressure than an upright cycle.