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The Advantages of a Curved Non Electric Treadmill Curved treadmills require you push the belt forward using your own energy and therefore will burn more calories than conventional treadmills. They reduce the impact on joints and therefore are a good alternative for walkers or runners with knee problems. However, they're not suitable for high-intensity sprinting workouts. Researchers have discovered that curved treadmills cause a narrower strike of the foot, which could cause injuries to