This problem was not unique to him. Lydiard realized that no runner truly needed to get faster in order to race faster over middle and long distances, because no runner, regardless of how gifted or how well trained he was, could sustain anything close to his maximum speed for even half a mile. But some runners could sustain a greater percentage of their natural speed over long distances than others could, and it was those runners—not necessarily the “fastest” runners—who won races. Endurance was the true limitation in running. And if that was the case, Lydiard concluded, then training should
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