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I can't get a single number Cardio Fitness Score

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I have a fitbit Charge 5 and I have been running over 10 minutes for months now.  Why can't I get a single number cardio fitness score?

 

I had a fitbit Alta, and upgraded to the charge 5 with GPS just for this feature.

 

Will fitbit support weigh in and tell me if I am doing something wrong?  Or explain the algorithm so I understand what's happening?  

 

I run with GPS.  I have tired the built-in GPS, Phone GPS, and Dynamic GPS settings. I do notice that the range has been improving.

 

The documentation says I should see a single number score after several runs on flat surface lasting over 10 minutes.

For the last few months I have been running 3-5 times a week and all are over 10 minutes.  For the last 3 weeks I have been running 2 miles, which takes over 26 minutes.  My route is flat.  I am slow, but I am consistent.  I don't stop while running.  I wear my fitbit all the time, except when charging. 

 

 

Below is todays run.  I have been doing this run for several weeks.  It's level and takes about 27 minutes.  Below that is my fitness score, which I don't think should be this good.

 

Today's RunToday's RunFitness ScoreFitness Score

 

 

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