Just signed up for OTF. Do we really need to buy heart rate

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Apple Watch and Orangetheory app (new) integration not showing heart rate info. Is anyone else having this issue and/or know how to fix it? : r/ orangetheory

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My heart is seeing the benefits of OTF : r/orangetheory

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Just signed up for OTF. Do we really need to buy heart rate monitor? Does Apple Watch is not enough? : r/orangetheory