You probably learned how to track your heart rate in school: Put your finger on a pulse point, like the inside of your wrist, and count how many pulses you feel in a minute. That yields your heart’s beats per minute, or bpm. Cool trick! you thought. And you promptly forgot about it. But your heart rate can be a useful piece of data. It’s a reliable metric for setting fitness goals that puts your cardiovascular health—ahem—at the heart of your workout.

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