Prone Bench Single Arm Dumbbell Rear Delt Fly
In SetGrip: Dumbbell Rear Delt Fly (Prone Bench, Single Arm)
- Secondary muscles
- Traps, Rhomboids
- Body part
- Shoulders
- Position
- Lying
- Laterality
- Unilateral (one arm at a time)
- Category
- Strength
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Working one dumbbell at a time from a face-down position on the bench combines chest support with a unilateral focus, so each rear delt gets its own strict set. Unlike the across-bench single arm version, you lie along the bench here, which frees the working arm to sweep straight out to the side.
How to do the Prone Bench Single Arm Dumbbell Rear Delt Fly
- Lie face down on a flat bench with a dumbbell in one hand, hanging towards the floor.
- Keep your arm straight and lift the dumbbell out to the side, away from your body.
- Pause for a moment at the top, then slowly lower the dumbbell back down to the starting position.
- Repeat for the desired number of repetitions, then switch to the other arm.
Tip: Lead with the elbows and think of reaching wide rather than lifting up.
Muscles worked
Primary
Delts · Shoulders
Front raises hit the front delt, lateral raises the side, and Y or rear raises the back head; whichever you pick, the burn should build across the top of the shoulder by the last few reps.
Secondary
- Traps — The upper traps will take over if you shrug, so a slight downward pull of the shoulders keeps them out of it.
- Rhomboids
Common mistakes
- Swinging from the hips — a small bounce at the bottom is the sign of a weight that is too heavy; lighten it and lift from a dead stop.
- Shrugging as you raise — the traps take over when the shoulders rise toward the ears; keep them down and lead with the elbows.
- Raising far above shoulder height — on lateral and front raises the upper traps take over past parallel, so stop around shoulder level unless the variation is built to go overhead.
- Locked elbows — keep a soft bend in the elbow throughout so the load stays on the shoulder rather than the joint.
Where it fits in a workout
Raises are accessory work and belong after the presses in a shoulder or push session. Superset lateral raises with a rear delt fly for a complete shoulder finisher.
How many sets, how heavy and how hard: see what the ACSM position stands support.
Variations and alternatives
Similar exercises
When to talk to someone
- Chest discomfort, feeling faint or lightheaded, or trouble breathing during or after exercise can be signs of a heart attack. In the US, call 911 right away; elsewhere, call your local emergency number.
- Heart, metabolic or kidney disease, or symptoms like these when you are active: talk to your doctor before you start or step up training.
- Pregnant: ask your obstetric care provider which exercise suits you.
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Sources
- ACSM position stand on exercise quantity and quality (Garber et al., 2011)
- ACSM preparticipation health screening (Riebe et al., 2015)
- ACOG Committee Opinion No. 804 on exercise in pregnancy (2020)
- CDC: About Heart Attack Symptoms, Risk, and Recovery (2024)
Sources checked on October 17, 2026. Full citations are in the exercise library.
Animation and exercise data: ExerciseDB, licensed to SetGrip. General information, not medical or coaching advice.