Treadmill: A machine with a moving strip on which one walks without moving forward. A treadmill was originally a wide wheel turned by the weight of people climbing on steps around its edge, used in the past to provide power for machines or as a punishment in prisons. The treadmill today serves as a device to maintain physical fitness. It is also an essential component of the exercise treadmill test, a stress test for heart disease.
Quick GuidePictures of the 7 Most Effective Exercises to Do at the Gym or Home (and Tips to Improve Form)
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