Wearable Heart Rate Monitors
Here's How to Seamlessly Track Your Heart Rate With Wearables
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Similarly, this Garmin HRM3 Premium Soft Strap Heart Rate Transmitter ($39, originally $50) is also worn separately and has received rave reviews for being soft and comfortable. Track your progress and your data on the Garmin app (you'll need this iPhone plug-in) or compatible device to ensure you're staying on target.