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Confused about SPM

Former Member
Former Member
I have tried to use data from a recorded walk to calculate step length. Following data is available:

Length of a walk: 2270m
Activity lengh: 21:22 minutes
Number of steps shown before I stopped the activity: 2504
SPM value from protocoll: 128

Now when I calculate the SPM based on data visible on screen I get out 117 (2504/1282*60).

So why do I see 128 in protocoll? This would mean I went 2726 steps and not 2504.