This treadmill was more difficult to use than I expected. It was easier walking on the ground than on this. I would jog to make it move faster, but sometimes it just stays there. I didn't take the trouble to buy lubricant because I assumed it would work properly and over time, will be easier to use, but I was wrong, so I had to return the product which was difficult in itself since I threw the box away. I had to get a new box which was first rejected by UPS then I had to buy a new box again. It was difficult to use and also difficult to return.