他正在提高两个方面：一方面是找回他后半程的优势。

And he is improving in two aspects: One, he is recovering his advantage in the last part of the race.

youdao

结果是，您将真实地了解您的比赛配速是否可以达到，而不是看您后半程表现如何。

As a result, you'll really know whether or not your goal pace is attainable or not by virtue of how you perform over the second half.

youdao

在顺势动作后半程，如果你的左手高于右手，同时左肩高于右肩，说明你遇到了这类问题。

You know you're making this mistake if your left hand is above your right deep into your follow-through, with your left shoulder much higher than your right.

youdao

so I actually was like almost falling asleep in the second half, so you know.

我后半程几乎都快睡着了。

来伦敦旅游的 - SpeakingMax英语口语达人