i mix it up..either flys, nice stretching movement, dumbbell pullovers are very good for expanding your ribcage. i went for an ekg recently and was informed my lungs are almost twice the size as to what they are used to seeing..maybe squatting had something to do with this, i do no cardio. on occasion i may bounce back to the bench and rep out. dips screw my delts up horribly.