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The Advantages of a Curved Non Electric Treadmill Curved treadmills burn more calories as you're required to move the belt with your own energy. They also reduce the strain on joints, which makes them a good option for runners and walkers with knee problems. They're not the best choice for intense workouts. Studies have shown that curved treadmills can encourage an elongated foot strike which can result in injuries in the calves and the hamstrings. Eco-friendly There are many options available i