I am no trainer nor a coach but I had similar problem. I was jogging and my HR was around 170 (I am 38 yo). Obviously that is not sustainable for a long time.
I hired a running coach to figure out what can I do. I was refusing to believe that I am unable to run (choking/gasping for air after 10min running). He corrected my posture a bit (straight spine, don't hunch, open my chest, not to wave with hands much) and then he said run. When my HR started crossing 155 (that was when I still felt very comfortable - could talk etc), he said slow down. And more slow down and more slow down (so my HR stays around 155).
Honestly, at the beginning, I could walk on 3in heals faster than run (while keeping my HR under 155). He said, it is not important how fast I run, but that I'm conditioning my body for running. So, I was not allowed to start walking (which would be faster) but had to mimick the running motion in very slow speed. I have preseted my HR monitor so it starts beeping when I cross 155 and I was trying to keep my HR around/under there.
I started 'running' this way 4x a week. Each day a bit longer. I think I started 15min. I loved that time. Once I got used to the really really slow running (aka once I stop being ashamed that an old lady with a dog walks faster than me 'running'), I actually enjoyed the motion. It did not leave me feeling like I want to die and that I cannot do it.
In about a months, I was able to 'run' in such pace about 45min-60min without any discomfort. That is when I started to play. I added small intervals in a bit faster pace (5.5mph). 30 sec faster and then 2-4min slow run to breath it out ...
About 5 months later (now), I can run about 5 miles in about 5.5-6 mi pace. Something I have never dreamed of. I know we all are different (I am primarily cyclist and have a sedentary job) but for me it was crucial to slow down (ridiculously slow down) and start condition my body for basically staying up right. Thinking about it, I realized that I constantly sit (on the bike or in front of computer), no wonder that a small jog was killing me.
Good luck and let us know how you're doing!



I may have been pushing a little harder than jogging at that point, I can't remember.
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) but had to mimick the running motion in very slow speed. I have preseted my HR monitor so it starts beeping when I cross 155 and I was trying to keep my HR around/under there.

