Have a treadmill and an elipitical and much prefer the treadmill. To date after 2 months, still haven't been able to stay on the elipitical for longer than 3 minutes, but I can walk on the treadmill for 30-45 minutes, no problem. Can't figure out why the elipitical kicks my butt so bad. Have it set on the least tension and it still makes my legs quivery and shakey after 2 min.