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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.
http://www.tips4running.com. How to Build Running Stamina. Here are three quick ideas to build up your running stamina. Don't get stamina confused with endurance. Endurance is being able to run a marathon or longer, but very slowly. Stamina is being able to hold on to a fast pace for between 1 to 5 miles. Stamina is very important for what we called in college Middle Distance Runners or people who raced the 1 mile, 2 mile, or the 5k. 1. Do some Tempo Runs! This really helps because a tempo run is a distance run at a quicker pace.