What is the Japanese verb for "to flex" (one's muscles)?


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!




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.

