Dumbbell One Arm Floor Fly
Dumbbell One Arm Floor Fly Exercise Description
The Dumbbell One-Arm Floor Fly is a unilateral horizontal adduction exercise that primarily trains the pectoralis major while the anterior deltoid and rotator cuff assist with shoulder control. Performing it on the floor provides a built‑in range limiter, helping you control shoulder extension at the bottom. Because only one arm moves, your trunk must resist rotation, promoting torso and scapular stability throughout the set. The elbow stays slightly flexed and fixed so the movement occurs at the shoulder joint, not the elbow. Expect a smooth, arcing path of the arm, a neutral spine, and a consistent wrist‑over‑shoulder finish.
- Muscle Groups: Chest, Pecs
- Target Muscles: Pectoralis Major - Sternal Head
- Assisting Muscles: Deltoid - Anterior
- Stabilizing Muscles: External Obliques, Infraspinatus, Rhomboid Major, Subscapularis, Trapezius - Lower Fibers
- Body Area: Upper Body
- Body Parts: Chest
- Body Surface: Front
- Body Symmetry: Unilateral
- Equipment: Dumbbell
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Horizontal Shoulder Adduction
- Joint Involvement: Single-joint
- Muscle Location: Mid Chest
- Movement Direction: Other
- Muscle Position: Anterior
- Gender: Male
How To Do The Dumbbell One Arm Floor Fly Exercise
‘- Lie supine with knees bent, feet flat. Hold one dumbbell with a neutral grip (palm facing inward) over the shoulder, wrist stacked over elbow.
– Set your shoulder blade by gently retracting and depressing it; keep ribs down and brace lightly so the low back stays neutral.
– Place the nonworking arm out to the side on the floor for balance.
– Maintain a slight, fixed bend in the working elbow (no locking or curling).
– Lower the arm in a wide arc until the back of the upper arm lightly contacts the floor or your comfortable end range—no bouncing.
– Keep the forearm vertical and wrist neutral; do not let the shoulder roll forward.
– Press the arm back along the same arc, finishing with the dumbbell centered over the shoulder (not across the midline).
– Keep hips and torso square; avoid rotating toward the working side.
– Pause, stabilize, and repeat for the side, then switch arms.
Dumbbell One Arm Floor Fly Tips
‘- Lie with knees bent and feet flat to create a stable base before starting the movement.
– Gently retract and depress the working-side shoulder blade before lowering the arm.
– Keep ribs down and brace lightly so your low back stays neutral throughout the set.
– Place the nonworking arm out to the side on the floor to help maintain balance.
– Maintain a slight, fixed bend in the working elbow—avoid locking it straight or curling the dumbbell.
– Lower the arm in a wide arc until the back of the upper arm lightly touches the floor or your comfortable end range, without bouncing.
– Keep the forearm vertical and the wrist neutral as you move.
– Do not let the shoulder roll forward at any point in the range.
– Press the arm back along the same arcing path you used on the way down.
– Finish each rep with the dumbbell centered directly over the shoulder, not crossing the midline of your body.
– Keep hips and torso square, resisting any rotation toward the working side.
– Briefly pause at the top to stabilize before starting the next repetition.
Dumbbell One Arm Floor Fly Beginner Introduction
The Dumbbell One-Arm Floor Fly is a single-arm dumbbell chest movement performed lying on the ground, emphasizing control as much as strength. One arm works through a sweeping, side-to-side motion at the shoulder while the elbow stays softly bent, so the chest and front of the shoulders drive the action instead of the arm. Because this is done on the floor rather than a bench, the upper arm meets the ground at the bottom, creating a natural stopping point that limits how far the shoulder moves into the stretch.
With only one side moving, the rest of the body stays quiet and steady. The ribs, stomach, and lower back remain organized against the floor, and the hips and trunk resist any urge to twist toward the weight. The nonworking arm rests to the side for light support as the working hand finishes each repetition with the dumbbell lined up over the shoulder. This combination of chest training, controlled shoulder motion, and anti-rotation through the mid-section highlights stability just as much as muscle engagement.