Abstract: Systems and methods for controlling application of horizontal resistive force to a user walking on a treadmill to provide substantially constant force even if the user changes his or her relative position on the treadmill. The systems and methods can improve the user experience when force is applied while also improving user safety. The system has a cable, a motor, and a system controller. The cable can be coupled to a harness to apply a horizontal resistive force to a treadmill user, and the motor can be coupled to the cable and configured to apply a motor force to the cable. The cable can have an adjustable operative length. The system controller can have a processor communicatively coupled to the motor and configured to adjust the force applied by the motor in response to changes in cable length and a measurement of the actual force applied by the cable.

Abstract: Systems and methods for controlling application of horizontal resistive force to a user walking on a treadmill to provide substantially constant force even if the user changes his or her relative position on the treadmill. The systems and methods can improve the user experience when force is applied while also improving user safety. The system has a cable, a motor, and a system controller. The cable can be coupled to a harness to apply a horizontal resistive force to a treadmill user, and the motor can be coupled to the cable and configured to apply a motor force to the cable. The cable can have an adjustable operative length. The system controller can have a processor communicatively coupled to the motor and configured to adjust the force applied by the motor in response to changes in cable length and a measurement of the actual force applied by the cable.