Heart rate is just a number. It’s not a condition,” Dr. Shrestha says. “And it is very dynamic. Some people live with a heart rate of 40 to 50 beats per minute and they don’t have symptoms of any kind and feel perfectly fine. But others with that same heart rate might feel tired, and we need to find ways to elevate their heart rate.”
Just another great example of how most doctors violate a foundation of statistics: you can't apply population statistics to individuals.
Good on this Yale doc for pointing that out.