How Good Are Semi-Recumbent Elliptical Bikes?

How Good Are Semi-Recumbent Elliptical Bikes? Semi-recumbent stationary bikes are very comfortable and easy to use yet still give you a great cardio workout. Hybrid models are available that can be used as elliptical or stepper machines. Which is better exercise recumbent bike or elliptical? An upright bicycle or elliptical will engage and strengthen muscles