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  • The Easiest, Cheapest Way to Train by Heart Rate

    The Easiest, Cheapest Way to Train by Heart Rate

    With fitness watches becoming more popular over the years, training by heart rate has gotten even more accessible — you can just glance down at your Garmin, Fitbit, Apple Watch, or whatever expensive gadget you wear on your wrist to find out how your heart rate is doing. But what if you never hopped on…