| Normal
People & The Mile Run |
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| v | On
average people in their early 20s can run a mile |
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about 7:30, or about twice the time it takes El |
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| Guerrouj |
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| v | This
factor-of-2 difference between average people |
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| and
world record holders is typical for physical |
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| activities
like running, jumping, swimming, etc. |
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| o | No
matter how hard we try, we can improve by at most a |
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| factor-of-2 |
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