Polar h10: why is my heart rate flat on the app, but continuous on

71% Polyester, 29% Spandex Made in the USA or Imported WORKS WITH EVERYTHING: Polar HRM works with many sports and smart watches (Polar, Garmin,

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71% Polyester, 29% Spandex Made in the USA or Imported WORKS WITH EVERYTHING: Polar HRM works with many sports and smart watches (Polar, Garmin,

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