Running on a Treadmill A treadmill is an exercise machine that lets a person walk, run, or jog in place. In gyms and homes treadmills are a well-known exercise machine. It helps people keep active even when weather is bad. Treadmill exercises can help strengthen the thighs and glutes. They are also good for burning calories and improving the health of your cardiovascular system. Before using a treadmill, it is essential to talk with a fitness expert. ...