There is a new tech that helps us measure something called HRV, heart rate variability and what happens between heartbeats electromagnetically, heart coherence. Turns out this is one of the best biofeedback devices and we no longer have to visit a doctor to get it measured, we can do it on our phones! Coherence is CRITICAL for improving all aspects of physical and mental performance as well as improving what hammers us in the Hero Community, cardiovascular disease and early death.