Resting pulse, like blood pressure and maximum heart rate are highly individualized. I've always had a low pulse rate, low blood pressure, but also a fairly low mhr.
I run about 35 miles per week, now. Swim twice a week. And lift 2 times per week (tied to swimming).
My resting pulse right now is 47 bpm. My blood pressure is always low in the a.m. before I have my coffee. It's probably around 95/60 right now.
I have a long history of endurance exercise. These numbers are not particularly low, even for my age. Many of my younger friends have pulses in the low 30's.
Low blood pressure is no guarantee you don't have heart disease, by the way. It is simply one marker of possible good health. My doctor told me last week my heart sounded strong, but he couldn't guarantee I wouldn't keel over from a heart attack in 15 minutes. He said my low blood pressure was a pretty good indicator that my chances for a stroke were slim. I'm more worried about a stroke. I'd hate to lose my mental faculties and still be alive. I'd rather kick the bucket in one fell swoop and get all that dying business over with quickly!