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


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