The usage of the verb muscle in this sentence from an online article sounds strange to me. According the several dictionaries I have consulted, muscle as a verb means to force your way into a place or situation, whereas in this sentence it apparently means to be equipped with muscle. I can only understand it as a similar usage to four-legged. Is my understanding correct? Is it a common usage at all?
Diogenes, the contrarian beggar-philosopher, is seated before the big storage barrel that he lived in. The figure, wrapped in a swirl of billowing cloak, is powerfully muscled.