Simply put, this doesn't work. The belt doesn't align and stay in line between the rollers. So, the belt actually drifts, constantly. After days of adjustments of the belt were in vain using the allen wrench, I called the customer service and got through the first two times. They told me to adjust the belt with the allen wrench which I had already done. The belt continued to drift and crucially, the belt itself kept sticking and I would trip over myself while walking. It was uncomfortable too because I had to hold onto the rails so that I wouldn't fall on my face. I had to keep stopping because it was exhausting. Another poor feature is that the treadmill does not lie flat. It can only be positioned at an incline. It was just too much and I ended up deciding to return it. Frustrating and a waste of time.
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