Ideal

• Rhomboids are evenly developed on both sides

You See

• Rhomboids are hypertrophied (on one or both sides)

Likely Cause

• Scapular protraction
• Short scapular protractors, especially pectoralis minor and pectoralis major (indirectly on humerus)
• Short subscapularis (with medial rotation of the arm)
• Long scapular retractors (look for hypertrophy especially in rhomboids and mid trapezius)
• Rounded shoulders
• Long (thoracic) spine extensors
• Kyphosis