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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.
3. Cut back on your sugar intake (but be realistic about your carb needs as a distance runner). Every runner knows that carbohydrates provide the best fuel for running and that most runners donât carbo-load for the marathon properly. But on a day to day level thereâs no need to consume so much sugar.