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Your metabolism is based on how efficiently your body tissues process nutrition and so your metabolism should be great. If you're asking about causality, running more can improve your metabolism, but having a high metabolism rate does not mean you will be an excellent runner. I am an endomorph and my metabolism is naturally really bad, but after a couple years of training, I've become a pretty good runner and my metabolism has improved. I have friends though who have excellent metabolism but are terrible runners. You need stamina to run, not a good metabolism.
5 Weird Perks of Being a Long-Distance Runner >>>. Their findings: Muscles do get better with ageâfor the most part. The older trained muscle in the masters athletes tended to have more fatty acids (which serve as fuel), a higher percentage of oxidative muscle fibers to produce more energy.