When used incorrectly, a treadmill can cause serious injuries, sometimes fatally. When you step on the deck, keep your feet on the rubber strips, not on the belt. And always do it with your shoes on. Always begin your workout at a slow pace and increase your walking speed gradually. Do not get off the treadmill while it's running. Avoid using your phone while on the treadmill as it can be distracting and puts you at risk of an accident. Ensure that the emergency stop plug is within reach, and if possible, clip it on your workout clothes where you can quickly press it in case of an accident.