A recumbent exercise bike is able to place a rider in a lean-back recline position. Many consumers purchase recumbent bikes due to their excellent ergonomic design and health benefits. The ergonomics of this bike allow its riders to distribute weight comfortably over a larger area of dispersion for additional support to the buttocks and back.
you have a bad back this is probably the exercise bike you should be looking to buy. The Recumbent Bike will have the seat closer to the ground and the pedals in front of you so your hips and knees are at the same levels. This will take the pressure off of the lower back.