As a result of engaging in activities that require our arms to move forward, there is a general tendency for the shoulders to become tighter at the front. This tightness at the front of the shoulders generally limits mobility of the shoulder joint that contributes to create further tension and tightness in the shoulders and neck area. In addition, limitation in the shoulders requires elbows and wrists to compensate through over-movement. Furthermore, tightness at the front of the shoulders is often associated with rounding of the upper back and moving the head forward out of alignment. A combination of some or all of these factors tends to generate tension and pain in the neck and shoulders, an unhealthy posture as well as restricted breathing.
The general approach in yoga is to notice a tendency and to observe its effects. If the tendency does not contribute to optimal flow of life energy and deeper peace of mind and heart, we try to find ways to counteract the existing tendency until there is greater balance.
The video below offers a short sequence of yoga movements focused on creating greater shoulder mobility to release tension and stress in shoulders and neck, to improve posture and to help with deeper breathing. As usual, there is never forcing or pain in yoga. The idea is just to do what we can do at this moment. Remember that yoga benefits result from practicing with patient persistence.
I hope you find this practice helpful.