may just be the extra range of motion. they probably don't hurt during skull crushers because you aren't moving your shoulder through that much extension like you are on the pullover. It bothers me to do skull crushers so I don't do them. It bothers me to do pullovers with a barbell but with DBs I am usually okay. It is only bad if I go really heavy. So I usually throw the exercise in at the end of a workout for one or two sets to failure at around 12-25 reps.



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