Thanks for all the information guys. I just have one more question. I tore my ACL playing basketball like a year ago. It is hard for me to run on a treadmill. I have been using those eliptical machines. You know the ones that when you are on it. It makes you look like a fag running in the snow. Well, it is low impact. My question would be is it as good as running. Sorry for the spelling. Thanks again!!