How Come I Can Run 2 Miles Straight, But I Get Winded Sprinting 100 Meters?

I Luv Yoplait

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I am 13 years old and I can run distance at my own pace for a long time (usually 20-30 minutes.) How come I can do this but I can't sprint even a couple dozen meters without getting tired. I mean, I get tired just sprinting to the other side of a basketball court.
 
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