I just started using it and for 20 minutes it seems I only burn 100 calories or so... compared to the treadmill where I burn 300/400 calories... is it just that I need to practice more to get use to the motions of the cross-trainer? I've only used it twice? A friend of mine he can burn 500/600 calories on a cross-trainer in 20/30 min... I am looking to burn fat around my waist and I like the motions the cross-trainer forces... moving both arms and legs.. and I suppose it is lower pressure on the legs? Basically what are the benefits of a cross-trainer? How long does it take to get good at using it? Is a cross-trainer better than a treadmill?