My gym has got in the new AMT machines made by Precor. http://www.precor.com/comm/en/amt/amt100i/ This machine is great for my cross training. Last year I strained my foot tendon in a spinning class and it lasted into my cycling season. Now i do an hour on the AMT. It is a much more dynamic workout than an elliptical trainer. It's like a combo stair master/elliptical trainer. The workout is very low impact for your knees but very challenging otherwise. I do 60 minutes. I usually burn 700 to 750 calories and it usually registers 5.5 miles in that time. The motion feels a little like standing up on a bike going up hill. You can set the resistance from 1 to 20. I try to keep the resistance between 12 and 14 and keep my heart rate average at about 157 bpm. I do push to 175 177 occasionally because that is where my heart rate registers when I am climbing the big hills here is the Hudson Valley. Check it out. My joke is AMT stands for Ass Modification Trainer.