'muscular-built' originates from the English word 'muscular,' which comes from the Latin word 'musculus,' meaning 'little mouse,' referring to the shape of muscles.

'musculus' transformed into the Old French word 'muscle,' and eventually became the modern English word 'muscular.'

Initially, it referred to the shape of muscles resembling a mouse, but over time it evolved into its current meaning of 'having well-developed muscles.'