Running

The article was interesting, and they are trying to say there's a chance that people who genetically have a lower HR, may tend to end up being more athletic which might lower it even more (and also put them at the higher scale of performance abilities) it's a lot of guessing.

And the last paragraph of the article was kinda stupid. Ain't nobody cruising around at 34bpm or 40bpm. I assume they mean to say if your training partners RHR is 34 to your mid 40's don't lose any sleep over it, but as worded using 'cruise around' and 'same mileage' makes it sound, to me, like they're referring to while exercising.

So if your training partner can cruise around with a 34 bpm heart rate while you sit in the mid-40s on the same mileage, that may reflect genetics as much as grit. That may be a frustrating or reassuring conclusion, and it may depend on which side of that heart rate threshold you sit on.