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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.
Some people have a faster metabolism than others. Some things that affect whether your metabolism is speedy or sluggish include things you don't control, like your age, sex, and genes. Focus instead on what really does make a difference: exercise.ry intervals. You can do them with any type of cardio. The basic idea is to switch back and forth between higher and lower intensity. You make it really challenging, and then back down your pace, and repeat. For example, do as many jumping jacks as you can for 1 minute, and then walk in place for 2 minutes.