Heart Rate Variability, or HRV, is a metric that measures the amount of time between each heartbeat and the variation in the timings. High HRV scores are a good thing, because it shows that you’re responding to the stimuli of your day by moving in and out of fight or flight, or rest and digest. If you have a low HRV, chances are, you’re only relying on one system, and it’s usually fight or flight.To know more about the HRV follow the blog.