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Cardio fitness has changed

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‎11-04-2024 00:05

‎11-04-2024 00:05

Since updating to the latest software not only are zones not calculating my cardio fitness has dropped from 46 to 50 (this has been classed as excellent and has heen stable for the last 11 months)to 38, this is in a week. What is going on, I've been exercising lots, good results and resting heart rate is good. Very demotivating 

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