We signed up for a membership at the YMCA last week. We have been a few times and getting a workout. I have checked out the ellipticals, and while they look like I would get a great workout, I am hesitant on using them. I am afraid that they would bother my knees. Why I don't know? I walk/jog the track, so why should getting on one of these machines be any different? You would thinkt that it would be easier on my knees, as there would be no pounding the pavement like on the track. I guess I should just bite the bullet and give it a try.