Do you wonder what all the fuss is about when it comes to Heart Rate Variability? (HRV). Well, Heart Rate Variability is a simple relatively inexpensive tool with a lot of value as a health key performance indicator in the area of stress recovery sleep and performance. If you want to be knowledgeable about HRV and its usefulness you want to focus on where the data is captured, the accuracy of the data captured, and the technology used to capture it.