According to About.com, elliptical machines are good at providing a low-impact workout while exercising both the upper and lower body. They are also beneficial for the older generation and those with aging joints.
About.com states that elliptical machines reduce stress and strain on legs by moving them in an elliptical motion. The shape that the elliptical machine forms follows that of the natural path of the ankle, knee and hip joints while walking, which provides a significant benefit. When running or jogging, every step causes a jolt to the body. In comparison, a workout performed on an elliptical machine is low-impact and affects the body's joints much less.