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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.
We'd all look and feel better, and race faster. Being at your healthy, ideal weight would certainly make you a faster runner. In fact, a study completed in 2007 found that for every percentage increase in body mass, it cost study participants an extra 1.4 percent in metabolic energy to propel themselves forward.t's a no-brainer that longer workouts burn more calories. But interestingly enough, when you run for longer than about 90 minutes, you improve your body's ability to use fat as fuel.