What is the rhetorical device of a gentleman's strength?

Metonymy because metonymy rhetoric means that you don't directly say the name of what you want to say, but call it by the name of another thing related to it, and the word "a gentleman has a strong body, energy and strong masculinity" usually means that men are strong, and this word is usually used to describe the excellent qualities of men, such as courage and strength, which expresses the idea that gentlemen should have strong inner and spiritual strength. By expanding the word "Zhuang" from the original physiological meaning to the spiritual level, it conforms to the characteristics of metonymy rhetoric, thus enhancing the image and expressiveness of language.