I used to be an avid runner, putting on 25 - 35 miles per week. My resting heart rate was going lower and lower the longer I was in training. On a low day in the morning (not immediately after waking) it went into the low 40's and for a while in the middle 30's like 34- 36. Somewhere I read that a low resting pulse is an indication that your cardiovascular system is in very good condition. It has been a while since I was in that condition - 20 years. I am getting back into running, now in my 50's (age, not heart rate), but it's a long hard raod!
