Hi, my friend told me to ditch rear delt flys as they are made redundant by face pulls. He said that rear delt flys only hit rear delts and mid/lower traps whereas face pulls (done on lower cables like the seated row machine) hit all those muscles as well + upper traps and medial delts. Is there any truth to this? He tried explaining it but I still dont really understand how upper traps and medial delts are involved. Please help. Thanks! I didn't find the right solution from the Internet. References: https://forum.bodybuilding.com/showthread.php?t=175373541 Business Solution Video