It is doing the exact same thing for him as reverse pec dec though. I like to use the cables for this exercise, origionally saw Jay Cutler do these, and is probably the only exercise I have ever wanted to emulate him on. Just grab the stopper ball on the cable cross-over (no grip attatchments), with your arms crossed... so your right arm grabs the left cable, left arm the right cable. Start with your hands together in front of your face, elbows straight. Contract your rear delts until you have a full contraction. The cables should make an X right at your chin.