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KirStang, it sounds like you need to warm up.. figure out how long you need to run to get warmed up. You can run anaerobically (sprint), but your aerobic fitness isn't that great..
For me, a warmup is at least 15 minutes. Sometimes I do it on a bike (recumbent bike at the gym is a great warmup before a treadmill run in the winter), sometimes I just take the first mile or two more slowly. It does take some time to increase the blood volume in your muscles, and if you use up all of your fuel by burning it anaerobically before you start working aerobically.. no wonder you run out of gas.
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"Without passion man is a mere latent force and possibility, like the flint which awaits the shock of the iron before it can give forth its spark."
— Henri-Frédéric Amiel
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