Your Peloton should automatically read your heart rate once you have put your Myzone belt on and it activates.
You will see your live heart rate in beats per minute (BPM) displayed on the screen along with your HR zones. The HR zones depicted on the Peloton display are based on the calculations Peloton has used so they will not reflect the Heart Rate (HR) zones in your Myzone profile.
MZ-3: We want to make sure you get those hard-earned MEPs, so to guarantee a successful Myzone upload to your account, keep the Myzone app closed while you are exercising on the Peloton as the Myzone belt can only speak to 1 device at a time.
MZ-1: You will need to keep your Myzone app open so your workout is captured. You may experience difficulty connecting or gaps in your workouts as a result.