How to adjust the tread belt on a treadmill?

To adjust the tread belt on a treadmill, first, unplug the machine for safety. Locate the adjustment bolts, usually found at the rear of the treadmill on either side of the belt. Use an Allen wrench to turn these bolts: turning them clockwise tightens the belt, while counterclockwise loosens it. After adjustments, run the treadmill at a low speed to ensure the belt is centered and functioning properly before using it at higher speeds.