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The Advantages of a Curved Non Electric Treadmill Curved treadmills require you push the belt forward using your own energy which means they will burn more calories than conventional treadmills. They also lessen the impact on joints, so they're an ideal option for runners and walkers with knee problems. They're not ideal for intense training. Studies have shown that curved treadmills can lead to the foot to strike more narrowly, which could result in