Rhomboid Strain or Spasm Exercises: References

Yoo, Won-gyu. "Effect of thoracic stretching, thoracic extension exercise and exercises for cervical and scapular posture on thoracic kyphosis angle and upper thoracic pain." Journal of physical therapy science 25.11 (2013): 1509. doi:  10.1589/jpts.25.1509. Accessed 4/25/16

Kisner C, Colby LA. Therapeutic Exercise Foundations and Techniques 6th ed. Philadelphia, PA: F.A. Davis; 2012