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Conventional dumbbell rear-delt flyes maximally load your arms when they're out to the sides, which is when the posterior shoulder musculature is in a shortened range. However, they neglect to strengthen the aspect of horizontal shoulder abduction when your arm is in front of, or across, your torso – when the posterior shoulder musculature is in a mid to lengthened range.
You can combine the side-lying rear-delt flye with a side-plank, which not only helps make the side plank less boring, but also serves double-duty and maximizes your training time. – Nick Tumminello