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The Advantages of a Curved Non Electric Treadmill Curved treadmills burn more calories because you have to propel the belt using your own energy. They minimize the strain on joints and therefore are a great option for walkers or runners with knee issues. But, they're not suited for intense sprinting exercises. Studies have shown that curved treadmills may encourage a narrower foot strike, which can result in injuries to the calves and hamstrings. Eco-friendly If you're in search of an eco-friendly treadmill, there's many options to consider. Woodway