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Your heartbeat lets you know how hard your heart is working to circulate blood throughout your body. Things like exercise, a fever, warm weather, medications, stress, and underlying health conditions ...

Every person alive right now carries a biological clock that does not pause for sleep, stress, or weekends. The human heart ...

Imagine if your smartwatch didn’t just tell you how many steps you’ve walked or calories you’ve burned, but how many heartbeats you’ve “spent” each day. According to a recent study, that number might ...