All about heart rate variability (HRV).

The metric offers insight to the functioning of the nervous system. Specifically it’s thought that when the metric is high, it’s a sign that the nervous system is in “rest and digest” mode, while when it’s low it signals “fight or flight” mode. This is content marketing from Whoop, a leader in the space of tracking HRV. They use it to generate an overnight “recovery score” to guide customers toward ideal levels of exercise the following day. ~ learn more