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Treadmill Machine Without Electricity A treadmill is an excellent exercise machine that can be used for walking, running or even interval training. This treadmill features a flat belt with incline settings, as well as a screen that shows time, speed, distance, and calories burned. It also has a power cord that's hard to reach for kids and can stop them from strangling themselves. This is a problem that motorized treadmills can be prone to. Safety Features A treadmill is a massive and heavy machine that can move at speeds