[toss1]

Exactly!

And that level of workout will probably produce an even significantly lower resting heart rate than the 52 I cited. And for the top endurance athletes in distance running, cycling, nordic skiing, although they might spend 10+ hours/week at threshold or some training zone, so double those extra 'exercsie beats', they also often have resting heartrates in the low 40s/minute, which will yield an even greater lifespan if it is measured in heartbeate.