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What Is a Non Electric Treadmill? While treadmills are perfect for indoor exercise, it can be difficult to replicate the running experience outdoors without being exposed to weather conditions. One method to achieve this is by using non-electric treadmills like a manual treadmill that is curved. While motored treadmills may offer more advanced features, such as LCD or LED displays, preset and interactive workout programming, and speakers, non-motorized options are still a good choice for those wh