The single arm kneeling dumbbell rear delt raise is a shoulder isolation exercise performed from a half-kneeling hinge, raising one light dumbbell out to the side to train the posterior deltoid. Kneeling on one knee with the torso folded over the front thigh gives the free forearm a brace on the knee, so the lower back is out of the lift and the working side cannot borrow a rotation from the hips. Training one arm at a time also shows which rear delt lags. Lifters program it late in a shoulder or pull session, after rows.
What Muscles Does the Single Arm Kneeling Dumbbell Rear Delt Raise Work?
- Primary: Posterior deltoid (rear delt)
- Secondary: Rhomboids, middle trapezius, infraspinatus and teres minor (rotator cuff)
- Tertiary: Obliques, erector spinae, gluteus medius (side glute)
How Do You Set Up for the Single Arm Kneeling Dumbbell Rear Delt Raise?
Set a light dumbbell on the floor to the right of a mat. Kneel on your right knee with your left foot planted ahead, both knees at right angles and hips square. Hinge forward until your chest rests close to your left thigh and prop your left forearm on that knee. Pick up the dumbbell with your right hand in a neutral grip, arm hanging straight under the shoulder, elbow soft, neck long.
How Do You Perform the Single Arm Kneeling Dumbbell Rear Delt Raise?
- Set the elbow bend at a soft angle and turn your thumb slightly down so the elbow, not the hand, leads.
- Raise the dumbbell out to the side, driving the elbow up and back while your chest stays folded over the thigh.
- Stop when the upper arm is level with your back and the dumbbell sits in line with the shoulder.
- Hold the top for one second, feeling the rear delt pinch without the shoulder blade snapping toward the spine.
- Lower along the same arc over two seconds until the arm hangs straight under the shoulder.
- Keep the dumbbell off the floor, hips still on the braced side, and start the next rep from the hang; switch sides after the set.
What Are the Key Form Cues?
- Pin your hips to the knee: the kneeling hip wants to swing toward the raising arm; keep both hip bones pointing at the floor.
- Push the floor away with the propped forearm: leaning into the front knee keeps the torso still while the arm works.
- Think of throwing the elbow at the wall beside you, not lifting the hand.
- Keep the wrist quiet and the little finger slightly higher than the thumb at the top.
- Let the rear delt stretch fully at the bottom before the next raise.
What Are the Most Common Mistakes?
- Choosing a dumbbell too heavy to raise cleanly: the torso lifts off the thigh and the rep becomes a rotation; drop to a weight you can raise with a still chest.
- Rotating the torso toward the working arm: the twist adds range the rear delt did not earn and shifts the load to the obliques and lower back; keep both shoulders level.
- Raising the hand higher than the elbow: the wrist leads and the upper trap and forearm take over; lift the elbow and let the hand trail.
- Shrugging the working shoulder at the top: the upper trapezius steals the top of the arc; keep the shoulder blade down as the arm rises.
- Dropping the dumbbell from the top: a free-falling eccentric loses half the rep and yanks the shoulder capsule at the bottom; lower over two seconds.
What Are the Best Single Arm Kneeling Dumbbell Rear Delt Raise Variations?
- Swiss ball dumbbell rear delt raise: chest on a stability ball, both arms at once, no kneeling brace.
- Two-arm kneeling rear delt raise: both dumbbells rise from a tall kneeling hinge with no forearm prop.
- Paused half-kneeling rear delt raise: hold each top for three seconds to lengthen time under tension.
- One arm rear delt dumbbell row: the elbow bends and pulls to the shoulder line, adding rhomboids and load.
- Single arm cable rear delt fly: a low pulley keeps tension at the bottom where a dumbbell goes slack.
How Do You Progress the Single Arm Kneeling Dumbbell Rear Delt Raise?
- Add 2.5 to 5 pounds once you complete all sets at the top of the rep range with the chest still on the thigh.
- Work from 10 reps per arm up to 15 before adding weight.
- Add one set at a time, from 3 up to 4 per arm.
- Slow the lowering to three seconds, or pause two seconds at the top with the hips locked.
How Should You Program the Single Arm Kneeling Dumbbell Rear Delt Raise?
Program the single arm kneeling dumbbell rear delt raise as a late accessory in a shoulder or pull session, after your rows and presses. Two sessions per week is plenty. Do 3 to 4 sets of 10 to 15 reps per arm with 45 to 60 seconds of rest, switching arms between sets. Pair it with face pulls or a lateral raise so the whole deltoid gets work.
