I've been working arms at the end of my workouts(Tris after chest, bis after back). I recall a thread somewhere, couldn't find it in the search, where interesting point was made. It stated something about arms get enough work by doing deads, chins, close grip bench, dips etc. So what I'm asking here... I'm doing a modified Rippetoes workout, 4x a week split. Is doing direct arm work over working my arms?