Weight loss training with an elliptical trainer is great for two reasons: 1)low-impact exercising, and 2) it works out both the upper and lower body simultaneously.
The low impact function of an elliptical trainer reduces the strain and stress on your body, particularly your ankles, knees and lower back. Your legs work in an elliptical motion. They never leave the foot pedals and there never is any reverse action.
In contrast, when you walk or run your feet impact on every stride. For runners that impact can be as much as 2.5 times your weight. For people who are overweight, the impact from just walking can be very detrimental and result in injuries and strains. Elliptical trainers can substantially reduce the potential for injuries.
It is important to transfer some the resistance load to your arms and distribute the exercise more evenly (there is a tendency to let your arms follow the motion of the handlebars, and let your legs absorb most of the resistance). This will result in more efficiently burning calories and reducing your weight using an elliptical trainer..