如果你想成为一名像刘翔一样优秀的运动员，你必须保持身体健康，准备好经受大量刻苦的训练。

If you want to be an excellent runner like Liu Xiang, you must be in good health and be prepared to go through much hard work.

youdao

如果你希望减轻体重或者增长肌肉，你需要去刻苦地训练几周然后才能看到结果。

If you want to lose weight or gain muscle, you need to train hard for weeks on end to see results.

youdao

在生理层次，刻苦的游泳训练过程中会释放出内啡肽，一种会让你感觉很舒服的自然化合物，名称来源于“内源性”与“吗啡”。

On the physiological level, hard swimming workouts release endorphins, natural feel-good compounds whose very name derives from “endogenous” and “morphine.

youdao

And you've been working really hard to get on the soccer team, you've been training.

你为了能入选特别刻苦地锻炼，还参加了训练。

I was 课堂 - SpeakingMax英语口语达人