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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.
The 11 Best Protein Sources for Runners. Protein is important for runners, and some sources are better than others. Protein is a very important component of a runnerâs diet. Your muscles are, after all, made of protein. And the protein you include in your marathon training diet or triathlete diet needs to be adequate to promote fast muscle recovery after workouts and to ensure that your muscles adapt fully in response to your training.