109 bpm, where you even exercising?
That is freakin hilarious! When I took my heart rate and it was 109, I thought when I posted that number, someone will say what you just said ~ a man no doubt, that runs 2 miles in 10 min!
Your max heart rate is 220 minus your age (your real age, ladies, not what you think you can pass for), and your target heart rate during exercise should be 60-80% of that for good results. So admit that you're about 90, or pick up the pace.
Well. This was harsh.
So ~ my heart rate is 166? Or should be? Okay. So what is your point?
I am not 90 I'm not!
Brockly is both right and wrong - yeah, bp is as important as hr but hr is easier to measure and a pretty good guide over the length of a training session if you don't just measure it once and let it go. I'd only worry about blood pressure if you already had serious health issues and then "you should consult a physician before beginning any workout program" as the informercials say.
So, working with the position that you aren't 90 and 300lbs (neither of which seemed likely) my point is if you'd like to see some health benefits to running, find a pace that puts you in your target heart rate and practice maintaining that pace until you can do it for 20-30 minutes, at least.
I'm a big advocate of the "walk before you can run" concept - if you can't maintain that pace for long, take a walk break until your hr comes back down, you catch your breath, then start running again. Gradually you'll be running more than walking, until you're running the entire distance at your target pace.
All that said, despite running since I was 10 (I'm 50 now) and completing numerous marathons, I think walking or cycling are better for you in the long-term, as they're much easier on the body, especially if there aren't dirt/grass trails available.