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The Advantages of a Curved Non Electric Treadmill Curved treadmills burn more calories because you're required to move the belt using your own energy. They also reduce the impact on joints, making them an ideal option for walkers and runners with knee problems. However, they're not suitable for intense sprinting exercises. has shown that curved treadmills may encourage an elongated foot strike which can result in injuries to the calves and hamstrings. Eco-friendly If you're in search of an eco-