Set Apple Watch stride
How can I just enter my stride length on Apple Watch some place .and not depend on GPS?
Apple Watch Series 6, watchOS 7
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You can't. See the ';Calibrate your Apple Watch' section in:
Calibrating your Apple Watch for improved Workout and Activity accuracy - Apple Support
"Whenever you walk or run outside using the above steps, your Apple Watch continues to calibrate the accelerometer by learning your stride length at different speeds."