Lying Arm Crossover
Lying Arm Crossover Exercise Description
The Lying Arm Crossover is a floor-based chest movement that emphasizes horizontal shoulder adduction using only body weight. In a supine position, you can focus on smooth control through the pectoralis major with assistance from the anterior deltoid, while minimizing unwanted motion at the spine. A slight elbow bend shortens the lever on the shoulder and keeps the action centered at the glenohumeral joint rather than the elbow. The scapular stabilizers (serratus anterior, middle/lower trapezius, and the rotator cuff) work isometrically to keep the shoulder blades anchored as the arms sweep in and out. Because gravitational torque is highest when the arms are out in a “T,” the movement demands the most control near the bottom; move deliberately and avoid bouncing. This low-load drill helps you practice a comfortable range, refine posture, and groove the “hug” pattern often used in pressing and fly variations while keeping the neck and lower back quiet in neutral.
- Muscle Groups: Chest, Pecs
- Target Muscles: Pectoralis Major - Sternal Head
- Assisting Muscles: Deltoid - Anterior
- Stabilizing Muscles: Infraspinatus, Serratus Anterior, Subscapularis, Trapezius - Lower Fibers, Trapezius - Middle 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: Other
- Muscle Position: Anterior
- Gender: Female
How To Do The Lying Arm Crossover Exercise
‘- Lie supine on a mat with knees bent, feet flat, head resting, and spine neutral (ribs down).
– Reach arms out to a “T” at shoulder height; keep elbows softly bent ~10–20° and palms facing up (slight external rotation).
– Lightly set your shoulder blades: draw them slightly together and down without shrugging.
– Exhale and sweep the arms up in a hugging motion until hands/forearms meet above the sternum; avoid lifting shoulders off the floor.
– Inhale and slowly open back to the “T,” stopping just above the floor; control the descent—no flopping.
– Keep wrists, elbows, and shoulders aligned; do not lock the elbows or let them drift behind the torso.
– Maintain a quiet neck and neutral lumbar spine; avoid rib flare or arching.
– Use a comfortable, pain-free range; if the front of the shoulder feels pinchy, reduce range or increase the elbow bend.
– Alternate which arm crosses on top to keep symmetry.
Lying Arm Crossover Tips
‘- Lie on your back with knees bent, feet flat, head resting, and ribs down to keep the spine neutral.
– Set the arms in a “T” at shoulder height with a soft 10–20° elbow bend and palms facing up in slight external rotation.
– Lightly draw the shoulder blades slightly together and down without shrugging to anchor them.
– As you exhale, sweep the arms into a hugging motion until the hands/forearms meet above the sternum, keeping the shoulders on the floor.
– Inhale as you slowly return to the “T,” stopping just above the floor and controlling the descent—no flopping or bouncing, especially near the bottom.
– Keep wrists, elbows, and shoulders aligned; maintain the slight elbow bend and don’t let the elbows drift behind the torso.
– Maintain a quiet neck and neutral lower back by avoiding rib flare or arching throughout the movement.
– Use only a comfortable, pain-free range; if the front of the shoulder feels pinchy, reduce the range or increase the elbow bend.
– Alternate which arm crosses on top to keep symmetry side to side.
– Focus on smooth, controlled horizontal shoulder adduction so the chest does the work while minimizing extra motion at the spine.
Lying Arm Crossover Beginner Introduction
The Lying Arm Crossover is a bodyweight chest exercise performed while lying on the back, with the arms sweeping in a broad arc. The movement centers on bringing the arms from a wide, outstretched position toward each other over the chest, similar to a gentle hugging motion. This highlights the chest muscles, with help from the front of the shoulders, while the muscles around the shoulder blades and upper back hold everything steady against the floor. A small bend at the elbows reduces leverage on the shoulders so the action feels more controlled at the shoulder joint rather than at the elbows.
Because tension peaks when the arms are stretched wide at shoulder level, the bottom portion of the arc tends to feel slow and deliberate. The spine, neck, and ribs remain relaxed and quiet on the mat, supporting a calm, organized posture. This low-load pattern often serves as a way to explore a comfortable range of motion and rehearse the sweeping, hug-like path used in many pressing and fly-style chest exercises.