When muscles are sore, they tend to tighten up; and this can affect the surrounding muscles – especially serratus anterior

, which attaches directly to the ribs, causing the ribcage to stiffen up. This means that a sore subscapularis may lead to dysfunctional movement of the shoulder blade over the ribs.

How do you relax your subscapularis?

Step 1: Lie face down on a bench or bed with one arm hanging off the side. Step 2: Take the relaxed arm and slowly raise it straight out until it is horizontal with your body. Hold for 10 seconds. Step 3: Slowly release to a relaxed position.

Why does my subscapularis muscle hurt?

Subscapularis tendonitis symptoms include pain when moving the shoulder especially when the arm is raised above the shoulders. Pain is often caused by hyperextension of shoulder joint during sleep resulting in hyperextension of rotator cuff and subscapularis tendon.