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Rapid heart while running

I am a 46 year female.  I have been running and working out regularly for about 8 years.  I have completed several half marathons and one full marathon.  I am interested in training for another full marathon, but I have a problem with my heart rate.  I am having a hard time keeping it below 170-175.  When it gets that high, I have a hard time continuing to run.  I have to stop and rest. I am not really running at a fast pace.  Probably around 9:00 minute miles.  I recover very quickly and then I can go again.  It is really frustrating, because I consider myself very fit.  I am 5'5" and I weigh 125 lbs.  What can I do to train my body to control my heart rate?
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Avatar universal
Arlington, VA
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