Cross-body Arm Stretch
The Cross-body Arm Stretch is a fundamental upper body mobility exercise designed to release tension in the rear shoulder and upper back. It involves gently pulling one arm across your chest to improve flexibility in the posterior deltoid and rhomboids.
Iridium tracks accumulated volume in the posterior deltoids and will typically prescribe this stretch as a cooldown when your per-muscle recovery status represents high fatigue. Because this is a time-based drill, the AI scales the duration to fit your specific time constraints so mobility work never displaces your main lifting sets. If you have selected high variation settings, the system will periodically rotate this exercise with other shoulder mobility movements to keep your routine fresh.
Form Cues
- Stand tall with a neutral spine
- Pull your arm gently across your chest using the opposite hand
- Keep your shoulders relaxed and down away from your ears
- Hold the stretch at the point of mild tension
- Don't shrug your shoulders up toward your ears
- Don't twist your torso to follow the arm
- Don't pull the arm so hard that you feel sharp pain
- Don't arch your lower back
Common Mistakes
- Hiking shoulders up
- Rotating the torso
- Bending the stretching arm too much
- Applying excessive pressure
Muscles Worked
This exercise primarily isolates the posterior deltoid, the muscle on the back of the shoulder that often becomes tight from posture issues or heavy lifting. It also stretches the rhomboids and mid-trapezius in the upper back, contributing to better overall shoulder mechanics and reduced scapular stiffness.
Primary
Secondary
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