To show us why, Dove tested an Apple Watch ($329) over the course of a month—and during three very different fitness classes—to see what it would tell her about her fitness levels. But why is this intel worth keeping track of, in your workouts and beyond? "In general, your heart rate gives you an overall picture of your health and wellbeing, and tells you how good your cardiovascular fitness is," says cardiologist Jennifer Haythe, MD. And one metric worth watching, in addition to your maximum and average hart rate, is your heart rate variability.
Heart rate variability (or "HRV") is determined by the amount of time between heartbeats. Doctors at Harvard Health explain that this metric is important because having a high HRV or a lot of variation in the time between heartbeats correlates positively with having good cardiovascular fitness. Low HRV, on the other hand, could signal that your body is stressed.
So what did Dove learn by having this particular data within her reach? Watch the video above to find out how to get smart with your tracking.
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