Arnie's twist pose:



And front on:



He may not have been 'wide waisted' per se, but he was narrow hipped making him look blocky, and highly unbalanced IMO

ETA - don't get me wrong, I'm not trying to knock Arnie here. He's a great BB'er. He just doesn't fit the (my) 'traditional' standpoint of a highly balanced/symmetrical "Adonis" BB'er.