An elliptical exercise machine gives you the benefits of both high-impact and low-impact exercises. While the importance of low-impact exercise is often stressed in our society: Our bone density can often suffer for the benefits provided by low-impact routines. Walking, running, sports -- all improve the density of our bones and keep them strong. The drawback of course, is that they are harmful to the soft cartilage in our joints.

The answer

When you workout on an elliptical exercise machine, your transported to almost a weightless environment...but not quite. The motion of a quality machine makes the strain on your joints almost zero, while still making the bones of your legs and spine bear the load of your body weight. Most good machines incorporate a full-body movement, very similar to the motion you would get while cross-country skiing.

An elliptical exercise machine also provides a distinct advantage over rowing machines, stationary bikes, treadmills, etc. When performing many of these popular aerobic exercises, you either end up over-extending your joints, or you'll also find that almost all aerobics machines have a point of zero resistance; where your muscles aren't challenged for a half a second, or more.

An elliptical offers continuous resistance, through the entire range of the exercise, while not ever placing your joints in a precarious position where damage might be done.

Is there anyone who shouldn't use elliptical equipment?

Not really. Since the impact to the joints isn't an issue, people from all walks of life and levels of health will find an elliptical exercise machine helps to improve their mobility and health.

Obviously people with severe mobility and/or cardiovascular system problems should always consult with a healthcare professional before undertaking a new routine, but most of you will find elliptical setups to be preferable to other equipment.