How to actually grow your chest bigger fast with machine pec deck fly.(Dm me “COACH” for coaching). Set the seat height so the handles or pads line up directly with the middle of your chest and keep a slight bend in your arms and focus on squeezing your chest muscles together. Pec deck fly form • machine chest fly tutorial #chestexercise #howtogrowchest #pecdeckflyform #howtopecdeckfly #machinechestflyform