Hi, I'm a new member to this forum, but I may be able to help you with this question. I use the eliptical trainer at the gym alot, but find it very boring, I dread going because of it. However that being said I have heard that it was very good low impact excercise for those who have knee trouble. But David Kirch "trainer to the stars" reccomends laying back on your heels a bit instead of staying straight or even leaning forward. this insures tht you don't build up to much of your upper front leg, and your toes won't fall asleep! Which has happened to me a few times! Hope this helps! Anie