I played professional soccer for 5 years, and worked with some of the best trainers around on running for optimum performance results.
Every single one had the same drill, and all swear by it. Most people call it "running lines", or "gut busters". The trainers I knew called them "progressives".
We would run around a soccer field with six cones marking different spots around the perimeter; one on each corner, and one on each side of the center of field mark. We would start by jogging once around the field, when we reached our starting point we would sprint to the nearest cone, then resume a jog till we reached the original starting point again. Then we would sprint to the second cone. So "progressively" we reached the point where we would end with an all out sprint around the entire field. Bear in mind that the jog is not a rigorous jog, its actually the resting portion of the drill, just slow and constant. Very important to keep the same pace throughout the drill.
I played the same position as you do, and I understand your question all too well. This exercise should do the trick if you do it a few times a week.