How do I calibrate the speed on my NordicTrack treadmill?

To calibrate the speed on a NordicTrack treadmill, one typically begins by inserting the safety key and entering the calibration mode. This can often be done by pressing and holding specific buttons - commonly the stop button along with the speed increase button simultaneously for several seconds. Once the calibration mode is activated, follow the onscreen or manual instructions; this will usually involve pressing another button to start the belt moving. The treadmill will then adjust itself to calibrate the speed, which involves running at various pre-set speeds. Upon completion of this process, it will generally either automatically exit calibration mode, or prompt you to end the session, usually by pressing the stop button. Always refer to the owner's manual for exact instructions for your specific NordicTrack model, as procedures may vary slightly between different machines.