Arm Crossover
- Synergist muscles
- Deltoid Anterior, Deltoid Lateral, Serratus Anterior
- Equipment
- Body weight
- Body part
- Chest
- Type
- Strength
The arm crossover is a bodyweight chest exercise that primarily works the pectoralis major (both the clavicular and sternal heads), with help from the front and side delts and the serratus anterior. Standing and swinging your arms across your body, it trains the pressing and adducting action of the chest with no equipment, making it a useful warm-up or a light, controlled finisher.
How to do the Arm Crossover
- 1Stand tall with your feet shoulder-width apart, knees soft, and core braced.
- 2Raise both arms out to the sides to roughly shoulder height, palms facing forward and elbows slightly bent.
- 3Squeeze your chest and sweep both arms forward and across your body until one forearm crosses over the other in front of your chest.
- 4Pause briefly at the cross point, feeling the contraction through your chest and front shoulders.
- 5Open your arms back out to the starting wide position under control, resisting the movement rather than letting them swing.
- 6Repeat for your target reps, alternating which arm crosses on top each rep to keep both sides even.
- 7Lower your arms and relax once you have finished the set.
Form tips
- Lead the movement with your chest, not your hands — think about pulling your arms together using the pec muscles rather than just throwing them across.
- Keep a slight, fixed bend in your elbows throughout so the work stays on the chest instead of the joints.
- Move at a steady tempo and squeeze at the cross point; the controlled return is where much of the tension lives.
- Brace your core and keep your torso still so momentum from your hips doesn't take over the rep.
Common mistakes
- Swinging the arms with momentum, which lets your shoulders and back do the work and removes tension from the chest.
- Letting the elbows straighten and lock out, which shifts stress onto the elbow joint and reduces the chest contraction.
- Rounding or hunching the upper back, which collapses the chest and weakens the squeeze at the cross point.
- Rushing the return and dropping the arms, which skips the eccentric portion where much of the muscle work happens.
Frequently asked questions
What muscles does the arm crossover work?
It primarily works the chest (pectoralis major, both the clavicular and sternal heads), with the front and side deltoids and the serratus anterior assisting as synergists.
Is the arm crossover good for beginners?
Yes. It uses only your body weight and a simple, controlled motion, so it's an accessible way to learn the chest squeeze and to warm up the shoulders and pecs before heavier pressing.
How many sets and reps should I do?
Because it's a light bodyweight move, higher reps work best — try 2–3 sets of 15–20 controlled reps, focusing on a firm squeeze at the cross point rather than speed.
Where should I feel the arm crossover?
You should feel it across the front of your chest as your arms cross, with some involvement of the front shoulders. If you mostly feel it in your shoulders or neck, slow down and lead with the chest.
