 go to the gym every day, and I get on the Stairmaster, and I do that until I fall off, and then I go to the elliptical, and it doesn't do what the Stairmaster does, but at least I can stay on there without falling off. But I'm just wondering, what level do I have to go to, and how long do I have to do it to have it do any kind of good? I do it for 25 minutes.