Once you are capable of completing a specific distance (eg marathon event), the next goal becomes beating your time (indicating a requirement for increased SPEED in your performance).

如果你已经能完成某个距离的跑步(比如马拉松比赛)，下一个目标就会是提高你的成绩(也就是提高速度的需求)。

youdao

After winning the silver medal at the 2004 Athens Olympics and a first-place finish in the 2009 New York City Marathon, Meb returned to the Games and improved upon his 2004 silver medal performance time by 23 seconds.

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Berhanu won the 2004 event in a time of 59.37, which was then the fastest half-marathon performance on British soil.

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