If you want to know how to incorporate the Dumbbell Rear-Delt Fly Exercise into your workout check out the following article for more information:
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These work similarly to the band pull-apart exercise but can be done with dumbbells, cables, or even gymnastics rings. To really emphasize the rear delts, do them with your upper back rounded and your chest supported on a bench—don’t let your shoulder blades pinch together as you raise the weights; just lift with the shoulders and stop short of 90 degrees. To hit the rear delts and upper back together, lift all the way to 90 degrees and squeeze your back at the top. Variations of the rear-delt fly appear in every workout to ensure balanced shoulder development.

What Muscles Am I Working?
The shoulder muscles are called the deltoids (or delts, for short). They’re triangle-shaped and originate at the collarbones, acromion joints, spine, and shoulder blades, and insert onto the humerus bones. Each deltoid muscle has three heads—that is, portions of the muscle that have separate sets of muscle fibers and perform a separate, distinct function.

Front deltoid. This portion of the muscle lies on the front of the shoulder, above the pectorals. It flexes the shoulder, raising the arm in front of the body and assists the pecs (chest) and lats (back) in rotating it internally. All pressing exercises, as well as front raise movements, will emphasize the front delts.

Lateral deltoid. The middle-head of the deltoid appears on the outermost side of the shoulder, between the front and rear delts. (Interestingly, while gym rats often refer to it as the “medial delt,” this term is technically inaccurate, as it’s actually the portion of the muscle that is furthest from the midline of the body.) The lateral deltoid raises the arm out to the side when the shoulder is internally rotated. It also does this when the shoulder is externally rotated (such as when your elbows are bent 90 degrees and you move your arms apart—imagine a “stick up” position, and you’re the one getting robbed!). Lateral raises are the primary exercise for hitting the middle (“side”) delts.

Posterior deltoid. The rear delt sits on the back side of the shoulder. It helps the lats extend the shoulder, moving your arm behind you, as in a rowing motion.

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