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.

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.