The difference between a treadmill and an elleptical is the amount of impact on the knee and hip joints, which is significantly lower with the elleptical. There are various manufacturers for elleptical exercise equipment, and this type of equipment is just one of several types of equipment you can buy for your home.

Like any machine thats electrical, you need to spend a little time learning and understanding the controls. When you buy, make sure that you have a heart rate feature, and a 'weight loss' mode that automatically creates a workout for you based on your weight and height. Be sure to adjust the machine to suit your size and range of movement.

Posture. You should always maintain a good posture, having your shoulders back, head up looking straight forward. Don't grip the handles too tightly and make sure that your weight is evenly distributed across both pedals. The most common mistake is to lean forward or droop the chin while on the elleptical.

Consistency. You must be consistent to get results, irregardless of the type of equipment you are using. Results do not come overnight, they take 6-8 weeks. All you need to do is remain consistent.

Equipment safety. The elliptical exercise equipment should be sturdy; it shouldn't wobble and you shouldn't feel like it will tip over. There should also be adequate room for your range of motion.

Additional features and performance. It should have all the add-ons necessary for your workout; as I stated before, a monitor to check hear rate, an indicator for various modes and resistances etc.