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Basically, the more you exercise, the more efficient your body becomes at dealing with lactic acid. There are two ways this happens. The first is that oxygen is used to convert lactic acid back to a form of usable energy. Your body learns to use oxygen more efficiently as the oxygen exchange in your lungs improves (aerobic). The second is the little bitty parts inside of muscle cells learn to use lactic acid as a energy source without conversion (anaerobic).
You don't have to push harder, necessarily. You can create an artificial "oxygen debt" by breathing less often, say every 3-5 strides. You can also stress the oxygen exchange by running on a track and sprinting the straights, walking the curves for a couple of miles.
Good luck with your goal!
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The difference between theory and reality is that in theory there is no difference.
"God made man, but he used the monkey to do it." DEVO
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