The Secret of the Speed of Running

If you want to measure how far you have ran, you can use at least three methods. If you want to get a precise result, you should install a mechanical device which could calculate the number of the revolution of the bicycle wheel. Running exercises your endurance and your speed was a natural ability.

Source: http://www.articlesbase.com/outdoor-sports-articles/the-secret-of-the-speed-of-running-5051672.html

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