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The Advantages of a Curved Non Electric Treadmill Curved treadmills burn more calories as you're required to push the belt using your own energy. They also lessen the impact on joints, making them an ideal option for walkers and runners with knee problems. They're not ideal for intense training. Researchers have discovered that curved treadmills encourage an enlarging of the foot, which can cause injuries to the calves and hamstrings. Eco-friendly There are many options