I am/was a runner (ran track for high school and college), but I have had 2 stress fractures in my ankle in a year, so my doctor has recommended I not run anymore. I have been doing the elliptical and realize that it won't be the same workout and resistance I would get if I was running outside, but does anyone know how they really compare? For the past couple of weeks I have tried to do some workouts for an hour and I can usually go about 7 miles in that time. I would like to do some interval training, but when I try to do it based on speed, I think I am going to make the machine break on the sprint part because it shakes so much. So should I just change difficulty/resistance for the "sprint" part instead? Any good workouts for the elliptical? I am trying to lose weight and so have been eating A LOT better too, trying to track my calories in LoseIt! on my iphone, going on the elliptical 5-6 times a week, but I am not seeing any weight loss or size changes just yet. Thanks for any help!