Elliptical Trainers reduce the stress and strain on your joints through an elliptical motion. Your feet never leave the pedals. It is like walking in midair. The shape of the elliptical movement mimics the natural path of the ankle, knee and hip joints during walking, jogging or running. With an elliptical trainer, you get a workout that utilizes the quadriceps, hamstrings, glutes, chest, back, triceps and biceps. The obvious benefit from exercising more muscles is that you tone more of your body and you end up burning more calories and fat in less time. In fact, there is no other fitness equipment that simultaneously works as many muscle groups. That is why many refer to an elliptical as a cross-trainer.