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The Advantages of a Curved Non Electric Treadmill Curved treadmills burn more calories since you have to propel the belt with your own energy. They also reduce the impact on joints, making them an ideal choice for runners and walkers with knee problems. However, they're not ideal for intense sprinting workouts. Researchers have found that curved treadmills promote a narrower strike of the foot, which can cause injuries to the calves and hamstrings. Eco-friendly There are m