ELI5 HRV - what is heart rate variability and why can a steady heartbeat be trouble?

Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast by ELI5 Explain Like I'm Five Podcast

Why does a perfectly steady heartbeat actually serve as a warning sign you should not ignore? If your heart is a drummer, why is a little bit of "bad timing" a good thing? How can your smartwatch tell you are stressed be...View more