I don't think your larger point here is invalid, but Arrieta has always been in terrific shape. If anything, it's the mental side of the game that's been most attributed to him repeating his mechanics better. I specifically remember a national TV breakdown where they had some ex-pitcher talking about how hard it would be to get on top of the sinker from the position Arrieta throws it without being in utterly ridiculous shape. Right, I'm not arguing your point that Arrieta repeating his mechanics takes more athleticism/strength than the average pitcher. What I was getting at is that he always was in shape to do it, even in Baltimore. Him slipping could be an age related thing like you mention, but I'm clarifying that Arrieta has always been in terrific shape and might have slid slightly due to age, not whipped himself into shape to be super Jake and now has lost it.