Too many marathoners emphasize volume of training over quality.

太多的马拉松人强调训练的数量而不是品质。

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Combining both frequency and duration refers to the volume of training, thus much easier to quantify.

频率和持续时间的结合指的是训练量，这很容易量化。

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But sometimes though athletes training for a large volume of training time is also long enough to really improve athletic performance is very slow, difficult to find effective ways.

但有的时候虽然运动员训练量很大，训练时间也足够长，运动成绩确提高的很慢，难以找到行之有效的办法。

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