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One important objective of training is to teach the body to conserve glycogen and deal
with lactic acid buildup. Your base period training will improve the blood's capacity
to deliver oxygen and withdraw wastes. Speedwork and long runs gradually push back
the point at which you start becoming anaerobic; they also teach you to deal with the
discomfort and burden of lactic acid buildup without slowing down as much as before.
When you have fine-tuned the muscles through speedwork, you will accumulate approximately
the same amount of waste, but won't have to slow down as much because now you're
used to the feeling.
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