Was Elfangor Really Buff?

I am practicing how I draw Andalites again, and an important question came up - the cover of The Andalite Chronicles shows what is presumably Elfangor looking like a sculpted god, but elsewhere in the series it's confirmed over and over that Andalites have weak upper bodies, particularly their arms. Ax's torso is described as boyish on like, two different occasions.

BUT THEN! VISSER confirms on its cover that Visser Three is jacked. Book 40, we meet Gafinilan, who is described like a bodybuilder. Book 41, Jake sees a super handsome and jacked Andalite and immediately assumes they're Elfangor. (It's not, but it *is* a morph based on his his younger brother Ax's DNA, so it's close enough?)

SO. IMPORTANT QUESTION.