Lying Arm Crossover
Lying Arm Crossover Exercise Description
The Lying Arm Crossover is a bodyweight chest exercise emphasizing horizontal adduction of the shoulder to target the pectoralis major. Performed supine, you cross the arms over the midline while lightly pressing the forearms or palms together to create self‑resistance, producing a focused chest contraction without equipment. The anterior deltoid and coracobrachialis assist, while the scapular stabilizers help maintain shoulder position against the floor. Keeping a neutral spine with ribs down and shoulders depressed centers the work in the chest rather than the neck or lower back. Alternating which arm crosses on top helps keep the pattern balanced side to side.
- Muscle Groups: Chest, Pecs
- Target Muscles: Pectoralis Major - Sternal Head
- Assisting Muscles: Deltoid - Anterior
- Stabilizing Muscles: Infraspinatus, Rectus Abdominis, Serratus Anterior, Subscapularis, Trapezius - Lower Fibers
- Body Area: Upper Body
- Body Parts: Chest
- Body Surface: Front
- Body Symmetry: Bilateral
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Horizontal Shoulder Adduction
- Joint Involvement: Single-joint
- Muscle Location: Mid Chest
- Movement Direction: Horizontal
- Muscle Position: Anterior
- Gender: Male
How To Do The Lying Arm Crossover Exercise
‘- Lie on your back with knees bent, feet flat. Keep head, neck, and spine neutral; ribs down.
– Set shoulder blades gently down and slightly back so the shoulders stay away from the ears.
– Raise arms toward the ceiling in line with the shoulders; elbows softly bent, wrists neutral, palms facing each other.
– Initiate by bringing the arms together across the midline. As they meet, lightly press forearms or palms into each other to create self‑resistance.
– Cross one forearm over the other at sternum level, keeping shoulders down and scapulae in contact with the floor.
– Pause briefly and actively “squeeze the chest,” maintaining even pressure through both arms.
– Return the arms to the vertical start under control; avoid letting the ribs flare or the low back arch.
– Alternate which arm is on top each time to keep the movement symmetrical.
– Use a comfortable range of motion; stop before the shoulders lift off the floor or if you feel pinching in the front of the shoulder.
– Common faults to avoid: shrugging, locking the elbows, bending wrists, or letting hands drift above head level.
Lying Arm Crossover Tips
‘- Keep your head, neck, and spine neutral with ribs down as you lie on your back.
– Gently draw your shoulder blades down and slightly back so your shoulders stay away from your ears.
– Raise your arms straight up in line with your shoulders with a soft bend in the elbows, wrists neutral, and palms facing each other.
– As your arms come together, lightly press your forearms or palms into each other to create self-resistance.
– Cross the forearms over the sternum, keeping shoulders down and shoulder blades in contact with the floor.
– Briefly pause and actively “squeeze the chest” while maintaining even pressure through both arms.
– Lower back to the vertical start under control, avoiding rib flare or low-back arching.
– Alternate which arm crosses on top each rep to keep the movement symmetrical.
– Use a comfortable range of motion and stop before the shoulders lift off the floor or if you feel pinching in the front of the shoulder.
– Avoid shrugging, locking the elbows, bending the wrists, or letting the hands drift above head level.
Lying Arm Crossover Beginner Introduction
The Lying Arm Crossover offers a simple way to work the chest using only bodyweight while lying on the floor. From a relaxed back-lying position, the arms travel upward and then sweep across the front of the body, with the forearms or hands gently pressing into each other. That gentle pressure turns the movement into a self-resisted squeeze, encouraging the chest muscles to engage even without weights or machines.
This crossover pattern mainly challenges the pecs, while the front of the shoulders and supporting muscles around the shoulder blades contribute to holding the arms in place. The spine rests in a natural, supported position on the floor so that the effort is felt more through the chest than in the neck or low back. Alternating which arm passes in front from repetition to repetition introduces an even workload from side to side and adds a coordination element that can suit slow, controlled strength work as well as mindful warm-ups.