I recently got to check out this cool new workout machine: the Biggest Loser Arc Trainer from Cybex. If you haven't tried an Arc Trainer yet, it's like an elliptical but with less impact on your knees (and you thought the elliptical was less impact on the knees than using the treadmill—well wait until you try this one). You're also able to burn calories faster, with less perceived exertion, than any other cross trainer too. How so? Well on the Arc Trainer, you're on a constant flow of movement since the way your feet and legs are moving is the same as that on an elliptical (AKA no pounding the pavement), except, there's no bottom platform that your feet are sliding up and down on. You're pretty much running in mid-air, while staying stationary. Pretty cool. It's an easier way to get your heart rate up and maintain that speed for a longer time too. (Or you can achieve a higher calorie burn in less time than you would on an elliptical.) But, gym machines are like sports bras—we all have a preference to what feels most comfortable when getting our burn on. So if you haven't tried an Arc Trainer yet, don't be scared, hop on one the next time you're at the gym and tell me what you think. Have you tried this cool new machine yet? Leave a comment below with your own review!