When most experienced runners go as fast as they can, they run at close to the same stride rate. For example, a video at the New York City Marathon showed that the top 150 runners had the same cadence, taking 92 to 94 steps a minute. The difference between the top runners and the others is that the best runners took longer strides.
However, you cannot run faster by consciously trying to increase your stride length. When you try to take longer strides than what feels natural to you, you lose energy and run more slowly.
Your heel hits the ground with great force. The tendons in your legs absorb some of this energy and then contract forcibly after the heel strikes the ground so you regain about 60 to 75 percent of that stored energy. When you try to take a stride that is longer than your natural one, you lose a great deal of this stored energy, tire much earlier and move your legs at a slower rate.
The key to running faster in races is to make your leg muscles stronger so you can contract them with greater force so they drive you forward with a longer stride. Competitive runners strengthen their legs by running very fast in practice two or three times a week, and by running up and down hills once or twice a week.
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