system Pensive via are recumbent bikes bad for your back Rational Indirect toothache
Are recumbent bikes really better for your back? - Quora
If you are 50 or older, have you considered riding a recumbent trike? These are 3-wheeled bicycles, that take most of the pressure off your tailbone. - Quora
Recumbent Bikes Versus Standard Bikes: What's the Difference?