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》

As such the term freestyle is often used as a synonym for the front crawl.

因此人们常说的“自由泳”基本就成了“爬泳”的同义词。

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Most competitive swimmers choose the front crawl during freestyle competitions, as this style provides the greatest speed.

但是在自由泳比赛中多数选手会选择爬泳，因为这种泳姿速度相对较快。

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Despite wanting to just crawl into bed and crash after the 10-hour overnight flight, I returned to the front desk and told the clerk that the room was not acceptable.

BBC: What to check out when you check in