only time i do them is after a grueling 20rep squat set.once i rack the wght i immediately grab a medium wght d.b(60-70lbs)and do 20 slow,deep breath pullovers concentrating on the stretch.by my 10th-11th rep my tri's are toasted so i try not to lock out.i sink my ass to the floor,breathe real deep and let the wght stretch my ribcage as much as possible.combining those with 20 deep breathing squat sets will make your chest wider than anything you've tried yet.