Diagonal Opens

Diagonal Opens Exercise Description

Diagonal Opens are a standing, bodyweight “across-the-chest” reach that trains shoulder horizontal/oblique adduction through a diagonal arc while you control the shoulder blade. The primary driver is the pectoralis major (clavicular fibers biasing a high diagonal toward the opposite shoulder; sternal fibers biasing a low diagonal toward the opposite hip), with assistance from the anterior deltoid. You’ll coordinate the humerus moving across the chest while the scapula transitions smoothly between retraction and protraction on the ribcage, maintaining neutral spine and relaxed neck. Use a slow, pain‑free range and focus on moving the upper arm (humerus) rather than the hand to feel the chest engage. Keep the elbow softly bent and the shoulders “down” to avoid shrugging. ([nervesurgery.wustl.edu](https://nervesurgery.wustl.edu/pectoralis-major/?utm_source=openai))

Muscle Groups: Chest, Pecs
Target Muscles: Pectoralis Major - Clavicular Head, Pectoralis Major - Sternal Head
Assisting Muscles: Deltoid - Anterior
Stabilizing Muscles: External Obliques, Serratus Anterior, Transversus Abdominis, Trapezius - Lower Fibers, Trapezius - Middle Fibers
Body Area: Upper Body
Body Parts: Chest
Body Surface: Front
Body Symmetry: Unilateral
Equipment: Bodyweight
Exercise Patterns: Other
Exercise Type: Strength
Functional Grouping: Horizontal Shoulder Adduction, Shoulder Flexors
Joint Involvement: Multi-joint
Muscle Location: Mid Chest, Upper Chest
Movement Direction: Other
Muscle Position: Anterior
Gender: Female

How To Do The Diagonal Opens Exercise

‘- Stand tall with feet hip‑ to shoulder‑width, ribs stacked over pelvis, chin level. Set shoulders “down and back” gently; brace the midline.
– Start with your right arm lightly crossed in front of your body: either near the left shoulder (for a downward diagonal) or near the left hip (for an upward diagonal). Elbow softly bent, wrist neutral.
– Inhale. “Open” the right arm along a smooth diagonal arc out and slightly back without rotating your torso or arching your low back. Allow a comfortable scapular retraction as the arm opens.
– Exhale. Draw the upper arm back across your chest to the start position, finishing with a gentle scapular protraction. Think “bring the biceps across the sternum” to cue the pecs.
– Keep the shoulder away from the ear, neck long, and ribs down throughout. Movement stays below any pinching or pain.
– Repeat for controlled reps on the right, then switch sides.
– Common faults to avoid: twisting the trunk, locking the elbow, shrugging, or letting the wrist collapse. Maintain a smooth tempo and a consistent diagonal path.

Diagonal Opens Tips

‘- Stand tall with feet hip‑ to shoulder‑width, ribs stacked over pelvis, and chin level to keep a neutral spine.
– Gently set the shoulders “down and back” and brace your midline before you start.
– Begin with the arm lightly crossed near the opposite shoulder for a downward diagonal, or near the opposite hip for an upward diagonal.
– Keep the elbow softly bent and the wrist neutral throughout; avoid locking the elbow or letting the wrist collapse.
– As you “open” the arm, move it along a smooth diagonal arc out and slightly back without rotating your torso or arching your low back.
– Allow a comfortable scapular retraction as the arm opens, then finish with a gentle scapular protraction as you return to the start.
– On the way back across the chest, think “bring the biceps across the sternum” and focus on moving the upper arm rather than the hand.
– Keep the working shoulder away from the ear, neck relaxed and long, and ribs down the entire time.
– Use a slow, controlled tempo and stay in a pain‑free range, stopping below any pinching or discomfort.
– Maintain a consistent diagonal path on every rep and complete controlled reps on one side before switching.

Diagonal Opens Beginner Introduction

Diagonal Opens is a controlled standing arm drill that highlights how the chest, front of the shoulders, and shoulder blades work together. Performed without equipment, it involves sweeping one arm on a slanted path across the front of the body and back out again while the shoulder blade glides along the ribcage. The chest muscles guide the motion, with an upward path placing more demand toward the upper chest and a downward path emphasizing the mid‑chest, while the front of the shoulder assists. The movement encourages tall alignment through the spine and a relaxed jaw and neck as the arm travels.

This pattern emphasizes slow, deliberate motion and a comfortable range so the chest rather than the hand leads the action. Attention stays on the upper arm moving over the ribcage while the shoulder blade transitions smoothly between a more squeezed‑back feel and a gently rounded position. A slight bend at the elbow, shoulders that stay heavy rather than lifted toward the ears, and steady breathing all contribute to a calm, controlled feel. Jerky speed, twisting through the torso, or stiffening the elbow tend to shift attention away from the chest and reduce the quality of the pattern.