Abstract: An automatic treadmill walking belt tensioning and alignment system can automatically maintain one or both of a treadmill walking belt's alignment and tension. The system can include force sensors that sense the tension of a treadmill walking belt about a treadmill roller by sensing a force applied to adjustment actuators positioned on opposite sides of the treadmill roller. The position of the roller can be adjusted to adjusted to ensure proper tension and alignment of the treadmill walking belt. Position sensors may be deployed on opposite sides of the walking belt to detect when the walking belt is off-center, signaling the adjustment actuators to operate to return the walking belt to its centered position.