Great book for learning more about trigger points: https://amzn.to/2CGgbPC (affiliate)

If you are having difficulty lifting your arm it could be a result of tightness and trigger points in the teres major muscle. Learn how to palpate, identify trigger points, treat them, and finally how to stretch the teres major.
Interested in additional shoulder exercises and treatment tips? Find out more at https://www.exercisesforpainfreelivin...
Instantly download a complete shoulder rehab guide for only $4.95 to learn:
• How our thoughts and words effect our pain and rate of improvement
• Role of posture in shoulder pain
• Special section on Frozen Shoulder
• Best sleeping position when you have shoulder pain
• The importance of belly or diaphragmatic breathing
• Exercises to improve posture
• Pictures and video of all exercises

Please leave any questions below in the comment section, thanks ~ Ed Deboo, PT
Bellingham Physical Therapy