Andro Stack X you could make your chest with flyes, good form totally essential. Much too often, I see people performing movements that resemble sort of hybrid between flyes and dumbell presses. These are about the most useless things that can for your pecs. Your elbows will have to be slightly bent during flyes in order to hyper-extending them. However, pivoting at the elbows as opposed to the shoulders Andro Stack X sneaky means of deferring or avoiding problem.