Elliptical machines have surpassed the Stairmaster and treadmill in popularity over recent years. This has sparked a treadmill vs elliptical debate. Although outdoor running is typically more effective, for an indoor exerciser, many consider the elliptical better than treadmill. Elliptical trainers provide the same cardio workout as running on a treadmill, in terms of heart rate and oxygen consumption, while reducing the impact on your joints you can experience while walking (extremely important if you are carrying extra weight). Many people also find interval training to be far easy on an elliptical than a treadmill because they have more control to make quick changes at each interval program level. The smooth, natural motion of elliptical machines is conducive to the long duration exercise needed to burn sufficient calories.