Dumbbell One Arm Low Fly
Dumbbell One Arm Low Fly Exercise Description
The Dumbbell One Arm Low Fly is a unilateral chest fly performed on a flat bench to emphasize the pectoralis major through shoulder horizontal adduction. Working one side at a time increases the demand on trunk and scapular stabilizers to keep the torso from rotating and the shoulder blade controlled on the bench. The movement follows a wide, downward arc to a comfortable stretch, then returns to the midline without turning into a press. A slight elbow bend is maintained throughout to reduce joint stress while keeping the focus at the shoulder. Expect primary work from the chest with assistance from the anterior deltoid, while the forearm and hand stay quiet with a neutral wrist for clean force transfer.
- Muscle Groups: Chest, Pecs
- Target Muscles: Pectoralis Major - Sternal Head
- Assisting Muscles: Deltoid - Anterior
- Stabilizing Muscles: External Obliques, Internal Obliques, Transversus Abdominis, Trapezius - Lower Fibers, Trapezius - Middle 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: Female
How To Do The Dumbbell One Arm Low Fly Exercise
‘- Sit at the end of a flat bench holding one dumbbell in a neutral grip (palm facing in).
– Lie back with head, upper back, and hips on the bench; feet planted and spine neutral.
– Lightly brace the abdomen and keep ribs down.
– Retract and depress both shoulder blades; keep the working scapula “set” on the bench.
– Extend the working arm above the shoulder with a slight elbow bend; free hand can hold the bench for balance.
– Inhale and lower the dumbbell in a wide arc out to the side, maintaining the same elbow angle and a neutral wrist.
– Stop when the upper arm is roughly in line with the torso (or a comfortable stretch) without letting the shoulder roll forward.
– Exhale and draw the arm back toward the midline by adducting the humerus; do not press or change elbow angle.
– Keep the shoulder away from the ear—no shrugging—throughout the lift.
– Finish with the dumbbell stacked over the shoulder, not crossing far past the midline.
– Maintain controlled motion; avoid bouncing at the bottom or twisting the torso.
– Switch sides and repeat with the opposite arm.
Dumbbell One Arm Low Fly Tips
‘- Keep your head, upper back, and hips on the bench with feet planted to maintain a neutral spine.
– Lightly brace your abdomen and keep your ribs down throughout the set.
– Retract and depress both shoulder blades and keep the working scapula “set” on the bench.
– Use the free hand to hold the bench for balance if needed.
– Start with the working arm extended above the shoulder, maintaining a slight bend in the elbow.
– Keep the elbow angle the same throughout the movement; do not bend or straighten as you move.
– Maintain a neutral wrist and quiet forearm/hand so the motion stays focused at the shoulder.
– Lower the dumbbell in a wide arc to a comfortable stretch, stopping when the upper arm is roughly in line with the torso without letting the shoulder roll forward.
– Keep the shoulder away from the ear—no shrugging—throughout the lift.
– Draw the arm back toward the midline by adducting the humerus, not pressing, and finish with the dumbbell stacked over the shoulder without crossing far past the midline, using controlled motion without bouncing or twisting the torso.
Dumbbell One Arm Low Fly Beginner Introduction
The Dumbbell One Arm Low Fly is a single-arm dumbbell chest fly variation carried out on a flat bench. This movement centers on guiding the arm through a broad, gently descending arc out from the shoulder and then back toward the line of the chest. The elbow remains softly bent and the wrist stays straight, so motion happens mainly at the shoulder joint. That pattern highlights the chest muscles, with support from the front of the shoulder, while the hand and forearm stay relatively relaxed for smooth force transfer.
Because only one side works at a time, the torso, midsection, and muscles around the shoulder blade work hard behind the scenes to resist twisting on the bench and to steady the upper body. The lifter lies along the bench with head, upper back, and hips supported, feet planted, and one arm reaching over the shoulder with the weight, while the free hand may hold the bench for extra security. The arm travels outward until a comfortable stretch appears across the chest, then returns under control until the weight sits above the shoulder rather than crossing far over the center of the body. Slow, deliberate pacing and a quiet torso highlight the emphasis on control, stability, and chest engagement in this bench fly variation.