Arnold claimed to have shitty calves at an early age. I've never seen a pic exemplifying this. I always thought his calves were pretty good, and I don't think you could train any way around it (curse of genes), and he had 95% of his mass by 20. His thighs were a weak point, so maybe that brought his calves up (kinda how Ronnie's calves look small because his thighs are fucking beach balls).