Sit on an incline bench with your chest supported and hold the cable handles in front of you. With a slight bend in your elbows, pull your arms outward and back in a wide arc while keeping your torso stable against the bench. Focus on squeezing your rear shoulders and upper back at the peak, then return slowly to the starting position under control.
Log your cable incline rear delt fly with back support sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.