noun
a device consisting of a continuous moving belt on which a person can walk or run while remaining in one place
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The gym has a variety of exercise equipment, including treadmills for cardio workouts.
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I usually watch TV while running on the treadmill at home.
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I need to hit the treadmill to work off all those cookies I ate.
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Being stuck in a dead-end job feels like running on a treadmill - lots of effort but no progress.