you are talking about an exercise which is commonly called "cable pull aparts" or "pathos arc".mohamed wrote:I don't mean this exercise
I mean hold the right pully with left hand , the left pully with right hand vertically above my head and pulling arms to horizantal
It's a lat exercise, and would be used when you wanted to target the lats but take the biceps out of the movement.
It's a good exercise, but I doubt you will be training anyone who would be at an advanced enough level to need to use it.
