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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.
Fitness Level. The most important factor determining run speed over a long distance is the runnerâs fitness level. An elite athlete may complete a mile in less than five minutes, and the world record at the time of publication is three minutes and 43 seconds, held by Hicham El Guerrouj. Someone new to running, using a run-walk system to build her endurance, may need between 12 and 15 minutes.