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With wearable fitness trackers becoming the norm among recreational athletes, more of us know at any instant what our heart rate is during workouts. What we might not know is what that data means. That’s a shame, because basing your workout intensity on your heart rate can be a great way to meet your exercise goals. “Heart-rate training gives you objective guidance on whether you’re on the right track, pushing too hard or taking it too easy,” says Janet Hamilton, an Atlanta-area running coach. Here’s what you need to know about training by heart rate.
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