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

5 Pcs Replacement Armband Strap Heart Rate Monitor

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Fitcent Replacement Armband Strap Compatible with OTF

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Replacement Strap For OTF /OTBeat / OT Burn /Wahoo/Powr Lab/FITCENT/LIVLOV/XOSS/Vortec and more Waterproof Armband Heart Rate Monitor. FITCENT Wrist

3Pcs Replacement Heart Rate Monitor Armband Straps Compatible with OTF, OTF Burn, Orange Theory Fitness, OT Beat Heart Rate Sensor