In the past 8 months, I have learned and been reminded about winterwx21's health and fitness more than I ever thought was possible.
On the heart rate thing... you don't have to be an elite level athlete to have a resting rate in the low/mid 40s. I know, because I do, and I'm nowhere near an elite level athlete. I lift quite often and do modest amounts of plain cardio, but almost never run. I am very cognizant of magnesium intake (which is something that many are deficient in) and that may be a factor in the low resting heart rate.