How would you say "he's flexing his arms" or "she flexes her arm" in Japanese?


I've been having a hard trying to find how to say this in Japanese without it
sounding weird. I don't know enough Japanese to say it which is why I wanted
to know if anyone knew. As in, "he's flexing his arms in the video" or "she
flexes her arm in the picture".




It is far from a multi-purpose replacement for the phrase "flex one's arm",
but if you mean a specific kind of pose below, we usually say 力{ちから}こぶを作る.

力{ちから}こぶ ("force bulge") is the word for the bumped muscle when you put your
strength on that body part, and typically refers to that of biceps.

[![flex
arms](https://i.stack.imgur.com/I3eYN.png)](https://i.stack.imgur.com/I3eYN.png)

[![力こぶを作る](https://i.stack.imgur.com/qWpEo.png)](https://i.stack.imgur.com/qWpEo.png)

