How do you know what’s a “normal” resting and active heart rate? The...

Health Tip: What Is Heart-Rate Variability? Wearable devices can measure the variability between the beats of your heart and indicate how relaxed you are — “an objective measure of how chill you are,” Mike Mallin, MD, says, noting the more variability the better. Mallin and Julie Foucher, MD, provide their top five tips for increasing heart-rate variability (HRV): 1. Sleep – a regular bedtime and at least an eight-hour sleep opportunity every night 2. Exercise – a consistent amount over time whi