Calibrating a Nike+ Sensor on a treadmill is not recommended for several reasons:
- Treadmills require calibration and other routine maintenance, and may not always yield accurate or consistent data.
- Your stride may be different on a treadmill than on the road due to variations in surface movement, incline and resistance.
- The treadmill's size may affect your stride length.
For best results, we recommend calibrating your sensor on a certified track.