You need to coordinate legs, arms, and breathing for the front crawl.

匍匐前进时，你要协调双腿、胳膊和呼吸。

《柯林斯英汉双解大词典》

Never force your legs to overstretch, or you can cause injuries.

不要过于用力压腿，否则你会受伤。

《柯林斯英汉双解大词典》

They can even give you mechanical legs or a new heart.

他们甚至可以给你装上机械腿或新的心脏。

youdao

And,if you are in a boat, keep your arms and legs out of the water.

VOA: special.2009.08.19

Now I call that, and it says, 20 tell me how many heads you want, give it a 20, and tell it how many legs 56 you want, give it 56, and it prints out the answers. I know, whoop-dee-doo.

请告诉我你想要几个头，设为，然后告诉它你想要几条腿,设为,最后它会打印结果，哇哦。

麻省理工公开课 - 计算机科学及编程导论课程节选

You know, so I have to get out and stretch my legs,

所以我得出来活动活动，伸伸腿，

愉快的音乐庆典 - SpeakingMax英语口语达人

"It may give you extra legs deep in the season, but you still have to have that God-given ability to hit the ball, " he said.

CNN: STORY HIGHLIGHTS

Big--you know, thick legs or, you know, a little roundness.

NPR: Anthony Hamilton: 'Ain't Nobody Worryin'

Nightly inspiration is found in the clubs, where you might see legs and arms flying in a breakdance battle.

BBC: Best places to get dance fever