The question is, what is the exercise for? We already know from studies that there's very little transfer even between logic-related tasks (say, Sudoku and Ches

The question is, what is the exercise for? We already know from studies that there's very little transfer even between logic-related tasks (say, Sudoku and Chess), so what sort of carry-over could we expect from fitness to logic-related tasks? I guess the answer will be something like: if you want to be a good programmer in old age, your best preparation is to program a lot and regularly. If you want to be a good mathematician, chess player,...., practice those. If you want to have a healthy body in old age, your best prep is regular exercise. You can do more than one, of course, but you can't substitute one for another.