Your watch
automatically calculates your stride length so it can accurately
measure distance and pace data in locations with poor GPS signal
reception, such as indoors or in tunnels.
The first time you use your watch, run or walk outdoors in an
open area for approximately 10 minutes. You can also run or walk
between tall buildings or trees for at least 30 minutes. This
allows your watch to learn your normal stride length. You should
only need to perform this step once.
Note: Do not cross
your arms or hold onto the treadmill handles or the stride sensor
may not detect your movement.