Basic Of Recumbent Stationary Bikes. if you are new to Used Stationary Bikes you may wonder what a recumbent bike is and why I would use it over an upright bike. I will start by saying I use both types. Which one I choose really has more to do with how hard I want to work. I find my cardio vascular work on a recumbent bike easier and more comfortable. It is more comfortable on my back because it has a seat with a back. If my back is bothering me a bit from my workout the day before, then I might choose the recumbent. Or perhaps I am in the middle of a book that I cannot put down and just want an easy workout then I will want to ride casually and read. I find this easier to do on a recumbent bike. enjoy your stationary bikes.