What are the steps to repair a belt on a NordicTrack treadmill?

To repair a belt on a NordicTrack treadmill, first ensure the machine is unplugged and then remove the plastic covers located at the back of the treadmill to access the rear roller bolts. Using an Allen wrench, loosen the tension on both sides by turning the bolts counterclockwise, which will allow space to replace or reposition the belt. If replacing the belt, one must carefully remove it from the deck and rollers, then slide the new belt onto the rollers, aligning it correctly around the motor at the front. Once in place, retighten the bolts on either side of the roller, adjusting them evenly to maintain proper belt tension and alignment. Finally, ensure that the belt is correctly centered and not too tight or loose by running the treadmill at a slow speed and making fine adjustments as necessary. Once satisfied with a smooth operation, replace the plastic covers before using the treadmill for exercise.