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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.
Updated March 22, 2017. Nutrition and hydration are critical to training for and running long distance races such as half marathons and marathons. A runner's diet is important not only for maintaining good health, but also to promote peak performance. Here are some basics about running nutrition and hydration, including what, when, and how much to eat and drink.