According to AZCentral, a gravity rider exercise machine is a piece of equipment that is part rowing machine and part abdominal cruncher. It was designed by Lloyd Lambert, inventor of NASA's Moonwalker treadmill and the DynoCam. Since its introduction in 1989, the aerobic rider has been marketed under several names, such as the Nordic Rider, the Power Rider and the Gravity Rider.
As stated by AZCentral, the gravity rider is operated by using a rowing movement while seated on a bicycle-style frame. The feet are planted on pedals, and the individual grips the handlebars while pulling in with his arms and pushing down and out with his feet. Next, the individual pushes out and up while the feet move up and in. Each complete cycle works against the weight of the body.
In regard to benefits, AZCentral writes that aerobic rider machines impact all large muscle groups in the body. A workout using the machine provides a low-impact overall cardio session that strengthens the legs, arms and back. They are also easy to carry and compact, and they take up less than 4 square feet of space. Aerobic rider machines are simple to use and are well-suited for beginners or individuals looking for a less rigorous alternative to treadmills or elliptical machines.