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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.
And, of course, the athlete who runs the fastest in any given race is the winner. Actually, itâs a bit more complicated than that. Body weight and movement efficiency also affect the rate of energy use during running. Heavier runners burn more energy at any given pace while efficient runners burn less.