This application,"crescent", instructs users on stationary cycle exercise. What Are Center Drive Elliptical Trainers? You have heard about elliptical trainers, however you may not know what center drive elliptical trainers are. You do not want to confuse center drive elliptical trainers with the average elliptical machines on the market, because center drive elliptical trainers do have some differences that are superior to your standard elliptical machines. Any time you hear about center drive elliptical trainers, you must be wondering why they call them center drive elliptical trainers and not just elliptical trainers. The reason is, is that center drive elliptical trainers have a different technology that separates them from normal elliptical trainers. They use a center drive technology, which is where they get their names of center drive elliptical trainers from.