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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.
1 Mid-distance runners may want to improve both stride length and rate. They will need to focus on glute, hamstring, hip, and core exercises.  Endurance runners may want a shorter stride length and a faster stride rate. They will want to work on core, glutes, and hamstrings.