Really, if you think about it... Wonder Woman is superhumanly strong. So she doesn't need bulging muscles. Heck, Superman could be built like Homer Simpson and still be stronger than a thousand humans. I often wonder how he even manages to be that buff when the available weights for him to lift would be so inadequate to stress his muscles. Mr. Incredible bench-pressed train cars to get in shape; Superman might need to do it with submarines or something.