Hi,
my RHR is around 44-45 too, and I am also no elite athlete. I work out regularly with Cathe and consider myself in decent shape, but in no way ultrafit either. I always thought it's partly hereditary, though obviously ones fitness level is a big factor.
I was just curious about all you others with low RHR:s; I heard a theory that people with low RHR:s take sort of longer to "warm up" for cardiovascular exercise; ie. ones they get their heart rates up there, they can go on quite long and strong. The story was about an Olympic gold medalist (with a low RHR), that always ran really good 'til the last spurt, where he was always left behind. Then he realized he had to start his final spurt before the others to have more time to "get in gear", and that's when he actually started winning his medals.
So I was just curious, I find I prefer longer cardios (I don't quite get into short bursts like say in Bootcamp or HSTA), and I was wondering if this could be the reason? What do you other low RHR:ers think? Sorry if I'm changing the subject here too much, but since there was a bunch of you here I thought...
Have a good day, everybody,
Maria