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The Advantages of a Curved Non Electric Treadmill Curved treadmills require you to push the belt forward with your own energy and consequently will burn more calories than conventional treadmills. They lessen the impact on joints and therefore are a good option for walkers or runners with knee issues. They're not ideal for high-intensity workouts. Researchers have discovered that curved treadmills encourage a more narrow strike of the foot, which can cause injuries to the hamstrings and calves. Eco-fri