Just adding this in. I have a nordic track, pretty sure they're not as popular now, but they give an amazing workout. The tension on the arm and legs can be adjusted, but it really targets the arms and back. It's not "fun", but it gets the job done. If you're only choosing between an eliptical and a treadmill, treadmill is much easier for me, but I can go an hour on the eliptical and it feels like maybe 10 minutes. Yeah, I'm weird.