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by brianwawok 1403 days ago
Right, I think it depends on activity level.

Couch potatoe and 45? You may have a health problem.

Cardio athlete and 45? Likely means you are in good shape.

My own resting heart rate varies from low 40s when I am in good shape (trained for a marathon) to near 60 when I am not (currently recovering from having a newborn).

I did need an EKG once, and the dr raised an eyebrow at my heart rate, but upon hearing I was a runner he was fine again.