Looking at the 220 BPM minus my age of 42
Is pretty crap as a guide, or I’m 14 yrs old.
Resting rate here is is around 38-40, max registered is 206, real age 47.
It’s how the heart behaves that’s more important.
Talk to doc if worried.
EDIT: I’ve also had a couple of ECGs which didn’t raise any comments except that it was the heart of an athlete.
Caveat emptor.