I've seen as low as 40 beats per minute, when I'm getting after it for months like I should. I had chest pains after catching covid that wouldn't go away, thought I might have had pneumonia, went to a walk in clinic for a chest x-ray just to rule it out, got an ekg, and was told to go to the emergency room because of "abnormlities".
After three hours and all sorts of imaging, I got a bill of pleuritis. The whole time I was hooked up to the machines I kept setting off alarms because my heart would drop to 40 beats per minute. I'm guessing their equipment was pretty accurate. They weren't worried because I told them I had ridden my bikes for thousands of miles that year, so 40 must be fine for people in the right kind of shape.
I get the fuzzy light headed near blackout thing sometimes if I stand up quickly, but that's usually after crouching for a while when you block off most of your veinous reurn and then open it up suddenly. Baroreceptors think your blood pressure is spiking when it isn't and they drop your blood pressure. I get that whole thing quite often, but not without crouching.
My blood pressure actually runs high. I'm around 145/80 most times, but I drive a truck all day, and nobody on the road knows how to drive..........