What Your ‘Heart Rate Variability’ Says About Your Health
Photo: BallBall14 (Shutterstock) One feature a number of fitness trackers offer is a metric called “heart rate variability,” or HRV, which is the interval of time between each heartbeat. But…
All Strange Things About India and world
Photo: BallBall14 (Shutterstock) One feature a number of fitness trackers offer is a metric called “heart rate variability,” or HRV, which is the interval of time between each heartbeat. But…