I was so fit in my 30's, I measured a heart rate of like 38 sitting in a work meeting.

I could amuse nurses in an emergency room by clipping my finger into the machine, instead of the patient I was with, to set off the alarms with the low numbers.

One time I came in with some severe stomach flu. I was lying on my back and the nurse said to another, "Come here! Look this guy is so thin, you can see his heart beating in his abodomen. (Due to the aorta passing through there, and the heart behind it being massive.)"

When your HR is low, you can get pretty dizzy if you stand up at the wrong moment between pumps.