Rear Delt Fly
Muscles worked
Instructions
- 1To begin, lie down on an incline bench with the chest and stomach pressing against the incline. Have the dumbbells in each hand with the palms facing each other (neutral grip).
- 2Extend the arms in front of you so that they are perpendicular to the angle of the bench. The legs should be stationary while applying pressure with the ball of your toes. This is the starting position.
- 3Maintaining the slight bend of the elbows, move the weights out and away from each other (to the side) in an arc motion while exhaling. Tip: Try to squeeze your shoulder blades together to get the best results from this exercise.
- 4The arms should be elevated until they are parallel to the floor.
- 5Feel the contraction and slowly lower the weights back down to the starting position while inhaling.
- 6Repeat for the recommended amount of repetitions.
table_chartRecommended sets and reps
These ranges vary depending on your training goal — adjust the load accordingly.
| Goal | Sets | Reps | Rest |
|---|---|---|---|
| Strength | 3–4 | 6–8 | 2–3 min |
| Hypertrophy | 3–4 | 10–15 | 60 s |
| Endurance | 2–3 | 15–20 | 30–45 s |
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About Rear Delt Fly
The dumbbell rear delt fly, torso bent forward and back flat, isolates the rear head of the deltoid. The arms spread out to the sides like wings, elbows slightly bent, also working the upper back and rhomboids. This exercise corrects the imbalances created by too much pressing and improves posture — the rear of the shoulder is almost always behind in people who do a lot of chest work. Aim to spread with the elbows rather than the hands, without shrugging or standing up. A light load and a clear contraction beat heavy weight poorly executed.
check_circleBenefits
- check_circleIsolates the rear delt, an often-neglected head
- check_circleImproves posture and front-to-back shoulder balance
- check_circleAlso engages the mid-back and traps
- check_circleAccessible anywhere, needing only light dumbbells
- check_circleImproves shoulder health by balancing front and rear work
lightbulbExecution tips
- lightbulbHinge forward to near horizontal with a flat back
- lightbulbSweep the arms out to the sides, elbows slightly bent
- lightbulbRaise to shoulder height, no higher
- lightbulbControl the descent without dropping the dumbbells
- lightbulbLook slightly down to keep the neck neutral
- lightbulbChoose a load noticeably lighter than for a shoulder press
warningCommon mistakes
- warningRounding the back and compromising the spine
- warningUsing momentum by rising up on every rep
- warningOver-squeezing the blades and shifting load to the lats
- warningGoing too heavy and bending the elbows like a row
- warningLooking straight ahead by craning the neck upward
- warningChaining too many fast reps without control
tuneVariations and alternatives
- tuneReverse pec deck machine — a guided path that removes the need to brace the back.
- tuneLying incline rear lateral raise — eliminates any momentum cheating thanks to the lying position.
- tuneCable face pull — combines rear deltoid work with the external rotators.
- tuneReverse fly with external rotation — adds a wrist rotation to further engage the rotator cuff.
person_checkWho it's for and level
The dumbbell rear delt fly suits all lifters, since the rear deltoid is almost always underdeveloped compared to the much more frequent pressing movements in most programs. It's particularly recommended for people with a hunched posture or shoulders that roll forward, a common issue for those who sit all day. Advanced lifters who do a lot of bench pressing and chest work benefit just as much to rebalance their development. Suits all levels thanks to its naturally light load and simple-to-learn technique.
shieldSafety and precautions
The main risk comes from a rounded back during the torso hinge, which strains the spine even under a light load. Always keep the back flat and hinge from the hips rather than the mid-back. Avoid using momentum by standing up on each rep, a clear sign the load is too heavy for your current technique. If holding the bent-over position becomes uncomfortable for the lower back, favor the lying incline-bench version, which removes the need for lumbar bracing.
calendar_monthWhere to place it in your program
This exercise is best programmed at the end of a shoulder or back session, as isolation work for the rear deltoid. Two to three sets of 12 to 15 reps with a light load are enough to properly stimulate this small muscle area. Two to three times a week suits it well, since this exercise recovers quickly thanks to its naturally light load. It pairs very well with the face pull and the reverse pec deck in a mini-circuit dedicated to shoulder health.
helpFrequently asked questions
How can I feel the rear delt more?
Use a light load, keep the elbows slightly bent, and think about opening the arms rather than squeezing the shoulder blades.
Bent over or lying on a bench?
Bent over demands lower-back bracing. Lying face-down on an incline bench removes cheating and isolates the rear delt better.
Free rear delt fly or the reverse pec deck machine?
The machine (reverse pec deck) removes the need to brace the back and keeps constant tension: easier to feel well. The dumbbell fly is more accessible without a machine and trains stabilisation more. Both target the same muscle.
How many times a week should this be done?
Two to three times a week is plenty, since this small muscle area recovers quickly between sessions.
Can this be done seated instead of standing?
Yes, seated bent-over works just as well and can be more comfortable for some lifters.
Why do I struggle to feel this exercise at first?
The rear deltoid is a small muscle rarely trained in isolation; the mind-muscle connection develops after several sessions.
Can this exercise be replaced by the face pull alone?
The face pull partly targets the same area but from a different angle; the two complement each other rather than replace one another.
Can this be done with a resistance band instead of dumbbells?
Yes, a band anchored in front of you reproduces a similar movement and works well for training without gym equipment.
Can this be trained to failure like other isolation exercises?
It can occasionally, but since it's a small stabilizing area, training to failure too often may compromise shoulder-joint comfort.
Does adding a slight pause at the top change the results much over time?
Yes, a brief pause increases time under tension at peak contraction, which can meaningfully improve muscle engagement over weeks.
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