I would like to know the Japanese verb for "to flex", but I haven't found much
information and the few dictionary options I have found are a bit unclear to
my understanding so I think that some people here can clear this up for me.

"To flex" one's muscles as when bodybuilders flex their biceps and compare how
big and ripped they look.

Example sentences: He flexes his bicep to show how big it is. Bodybuilders
flex their muscles to impress the audience.

Answers very appreciated!
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2018-02-20T04:34:21.383
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2018-02-20T10:19:54.027
2018-02-20T05:42:01.647
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question
verbs word-requests
What is the Japanese verb for "to flex" (one's muscles)?
You can use:

  * ～に力を入れる
  * ～を収縮させる

For example 上腕二頭筋に力を入れる and 大腿四頭筋を収縮させる.

収縮 sounds relatively technical but it can be safely used in conversations.
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2018-02-20T05:41:01.600
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2018-02-20T05:41:01.600
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answer
There's a character in _Undertale_ who is a muscle maniac and likes flexing.
Since it got an official Japanese translation, [one of the related example
sentences](http://ja.undertale.wikia.com/wiki/Aaron#.E3.83.95.E3.83.AC.E3.83.BC.E3.83.90.E3.83.BC.E3.83.86.E3.82.AD.E3.82.B9.E3.83.88)
is:

> Aaron is ready for your next **flex**.  
>  Aaronはあなたが次に **力こぶを作った** ときに向けて準備している  
>  [Flex後に中立]

So I think you can use 力こぶを作る which consists of:

  * 力こぶ = large biceps; well-developed biceps​ (from [jisho](https://jisho.org/word/%E5%8A%9B%E3%81%93%E3%81%B6))
  * を作る = to make
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2018-02-20T10:19:54.027
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answer