Mariposas
Best Rear Delts Exercises
By Zachary, builder of Mariposas · Reviewed against published exercise-science sources (references)
· Last updated June 2026
The rear deltoid is one of the most chronically underdeveloped muscles in the upper body, not because people skip it intentionally, but because most pressing and even rowing movements let the lats and traps take over before the rear delt does any real work. The difference between effective rear delt training and junk volume almost always comes down to position and intent: shortening the range of motion, using too much weight, and relying on momentum produces a solid pump in your traps and exactly nothing in the muscle you actually wanted to train. Exercises that truly load the rear delt tend to put the shoulder in horizontal abduction with external rotation, keeping tension on the posterior head rather than handing the work off to neighboring muscles. Logging your rear delt sessions, including the specific angles, cable heights, and weights you used, is surprisingly valuable here because small setup tweaks create big differences in feel. Track your training for free in Mariposas and earn pets as you build consistency.
How to train your rear delts
The rear delts respond well to moderate loads and higher rep ranges, generally because heavy loading encourages the traps and rhomboids to compensate before the target muscle reaches a challenging stimulus. Most experienced lifters program rear delt work two to three times per week, often as an accessory at the end of an upper body day, since the muscle recovers quickly and benefits from repeated exposure. Movement variety matters here more than in most muscle groups: a face pull, a cable rear delt fly set low versus high, and a prone dumbbell raise each place the shoulder in slightly different positions and hit the muscle from angles that a single movement simply cannot replicate. Keeping rest periods moderate and controlling the eccentric, rather than letting the weight swing back, is what separates a set that actually builds the muscle from one that just tires your arms out.
FAQ
- Why do I feel rear delt exercises mostly in my traps instead of my rear delts?
- This is the single most common complaint, and the cause is almost always one of three things: the weight is too heavy, the elbow is too low, or the movement is initiating with a shrug rather than a pull through the upper arm. On a cable or dumbbell rear delt fly, try dropping the weight significantly and focusing on driving your elbow back and slightly upward, as if you're trying to point your elbow at the ceiling. Keeping your elbow higher than your wrist throughout the movement also helps isolate the posterior deltoid rather than the mid and lower trapezius. Many lifters find that adding a slight pause at the peak contraction, holding for a full second before releasing, forces the rear delt to do the work instead of using momentum to get there.
- How is the rear delt actually different from the rest of the shoulder, and why does it need separate training?
- The deltoid has three distinct heads, anterior (front), medial (side), and posterior (rear), and they function quite differently. The anterior head is heavily involved in pressing movements like bench press and overhead press, to the point that many lifters overtrain it without realizing it. The medial head gets direct work from lateral raises. The posterior head, though, primarily functions to pull the arm backward in the horizontal plane and to externally rotate the shoulder. That pattern shows up in very few compound movements unless you specifically seek it out, which is why people who press and pull heavy but never do targeted rear delt work often end up with rounded, internally rotated shoulders and a visual imbalance at the back of the shoulder cap.
- Does face pull train the same thing as a rear delt fly, or do they hit the muscle differently?
- They overlap, but they are not the same exercise. A face pull with a rope at upper-chest or face height, pulling toward your nose with elbows flared high and finishing in external rotation, trains the rear delt plus the external rotators, particularly the infraspinatus and teres minor. A strict rear delt fly, whether on cables or with dumbbells, isolates the posterior deltoid more directly by removing most of the external rotation component. Both are useful, and many programs include them in the same training block for exactly this reason. If you can only pick one for general shoulder health and posture, the face pull wins on versatility; if you want direct rear delt hypertrophy with less rotator cuff involvement, a fly variation is more targeted.
- How long does it realistically take to see rear delt development if they've been neglected?
- Noticeable visual change in a genuinely underdeveloped rear delt can show up within eight to twelve weeks of consistent, targeted work, assuming the training is actually placing tension on the muscle rather than the traps. The rear delts are a relatively small muscle group, so they can hypertrophy at a decent rate when you're truly a beginner to the movement. What slows people down is not frequency or volume but rather spending the first several weeks doing the exercise incorrectly, so the real clock starts only when you've dialed in the feel. Photographs taken from behind and to the side in good lighting every few weeks are genuinely useful here because the posterior shoulder is almost impossible to see in a mirror mid-set.