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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.
Exercise is a key ingredient to increase metabolism. The aerobic workouts burn more calories in the short term, and weight training builds the muscles that will boost your metabolism in the long run. During heavy physical exertion, the muscles may burn through as much as 3,000kJ (717 kcal) per hour.