What about a person with an athletic body?
那運(yùn)動員般的身材怎么形容呢？

You can describe him or her as muscular, fit, strong, in good shape, or “ripped” – that's a slang word meaning that the person has very well-defined and visible muscles – like the guy in this photo.
你可以用muscular、fit、strong、in good shape來說，或者用“ripped”——這是俚語，意思是一個人的身材特別有型，肌肉線條明顯——就像這張照片里的男人。