Hi Ginger, I have a manual treadmill while the GF has a motorized one. I have used both. Hers you set to the speed you feel comfortable with and hold on to the rails and walk or run behind it. Mine on the other hand gives you a work out just to keep it going. The resistance is controled by the incline. In short if you want a easy controled work out get a motorized treadmill, but if you're serious and want a workout that makes you burn get a manual. Good luck, Tom :
