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Running speed is a result of the length of your stride by the frequency of your stride.
Starting out it's better to keep your stride lengths small and the stride frequency high. The goal is to hit the ground between 160 and 180 times per minute. Count the number of steps you are taking in one minute. The more steps you take, the more you burn in energy and the harder it is to run. Run at a comfortable pace and Increase your pace gradually till you can do between the 160 to 180 steps goal.
Do it gradually so that you don't hurt yourself and deprive yourself of a wonderful way to do aerobic exercise. Also don't run with your body stiff. Stay loose and run with a smooth movement. You'll run further and enjoy it more.