Running on a Treadmill A treadmill is an exercise device that lets a person walk, run, or jog in place. It is a popular choice in gyms as well as at homes treadmills are a well-known exercise equipment. It can also help people stay active when the weather gets bad. https://treadmill-sale07357.webbuzzfeed.com/25215150/what-is-treadmill-history-of-treadmill