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I would recommend against sprinting. Sprinting is far harder on your body than running. Sprinting can be much more damaging to your joints/muscles than simply running (how many of you have seen someone running a 10k runner pull up with a hamstring pull?) and should not be done everyday. If you're just out to burn calories without hurting yourself, look into swimming or using an ellyptical, both burn more calories than running without the impact. Running, however, will allow you to avoid staying in the same place for hours on end.
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