Smart Workout Diary

Dumbbell Posterior Fly on Stability Ball

The dumbbell posterior fly on a stability ball is a chest-supported rear-delt exercise performed while lying face down on the ball. It primarily trains the rear deltoids, with assistance from the upper back muscles that control the shoulder blades. The ball-supported position can limit momentum and helps develop shoulder strength, posture, and upper-body control.

Demonstration

Dumbbell Posterior Fly on Stability Ball — demonstration 1
Dumbbell Posterior Fly on Stability Ball — demonstration 2

Instructions

  1. Set up the ball: Place a stability ball on a non-slip surface and hold a light dumbbell in each hand.
  2. Take the position: Lie face down with your chest supported on the ball, feet planted wide for balance, knees softly bent, and arms hanging below your shoulders with palms facing each other.
  3. Brace and set the shoulders: Keep your neck long, lightly brace your abdomen, and draw your shoulder blades gently down and back without shrugging.
  4. Raise the dumbbells: With a slight bend in the elbows, lift both arms out to the sides until they are roughly in line with your torso. Move smoothly and keep the wrists neutral.
  5. Lower with control: Pause briefly, then lower the dumbbells slowly until the arms hang under the shoulders. Do not let the weights pull your shoulders forward.
  6. Finish safely: Complete all repetitions under control, place the dumbbells on the floor, and step away from the ball carefully.
Muscle Group
Rear Delts
Other Muscle Groups
Upper Back
Type
Strength
Mechanics
Isolation
Equipment
Dumbbell, Exercise Ball
Difficulty
Intermediate

Technique tips

  1. Use a light load: Rear deltoids respond well to controlled repetitions; reduce the weight if you need to swing or shrug.
  2. Keep the chest supported: Maintain firm but comfortable contact with the ball and keep both feet planted wide to limit rolling.
  3. Lead with the elbows: Think about moving the upper arms outward rather than squeezing the dumbbells upward with the hands.
  4. Control the range: Stop when the arms reach torso level; forcing a higher range can shift stress into the shoulders and neck.
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