To avoid knee pain, you can run on soft surfaces to strengthen your leg muscles.

为避免膝盖疼痛，您可以在柔软的平面上跑步以增强腿部肌肉。

youdao

The exercises are designed to strengthen your stomach muscles.

这些活动目的在于增强你的腹部肌肉。

《牛津词典》

To avoid knee pain, you can run on soft surfaces, do exercises to strengthen your leg muscles, avoid hills and get good running shoes.

为避免膝盖疼痛，你可以在柔软的地面上跑步，多加练习来加强腿部肌肉，尽量不在斜坡上跑，并买双好的跑鞋。

youdao

And so, if you don't do anything to open those muscles up and strengthen your...

所以，如果你不做什么把这些肌肉打开，并且加强你的……

健康生活 - SpeakingMax英语口语达人

Eventually, Jeter was able to learn new ways to strengthen the muscles in his legs and also create strategies on how to field ground balls by using efficient angles.

FORBES: Connect

Your muscles are going to ache for a while, until they strengthen.

FORBES: Why I Never Dated Mia Sara and 7 Reasons Any Investor Should Write

Inspired to ask for something on a daily basis, Popescu shows us all the everyday ways we can strengthen our asking muscles.

FORBES: Negotiation Resources For Women Who Aren't Afraid To Ask