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  2.  Hardwick, D. H., Beebe, J. A., McDonnell, M. K., & Lang, C. E. (2006). A comparison of serratus anterior muscle activation during a wall slide exercise and other traditional exercises. The Journal of orthopaedic and sports physical therapy36(12), 903–910.
  3. ↑ Jump up to:3.0 3.1 Ludewig, P. M., & Cook, T. M. (2000). Alterations in shoulder kinematics and associated muscle activity in people with symptoms of shoulder impingement. Physical therapy80(3), 276–291.
  4.  Park, K. M., Cynn, H. S., Kwon, O. Y., Yi, C. H., Yoon, T. L., & Lee, J. H. (2014). Comparison of pectoralis major and serratus anterior muscle activities during different push-up plus exercises in subjects with and without scapular winging. Journal of strength and conditioning research28(9), 2546–2551.