One of the most common problems I treat in swimmers is shoulder pain.
This is often a result of core stability issues and loss of streamline position.
This video shows 5 exercises which focus on core stability for swimmers and helping streamline position.
Aim for 2-5 circuits of 30-60 secs as able.
Rest for 30-60 secs as needed.
Engage your core to avoid arching your back in all the exercises.
Control and quality over speed and quantity is the key.
Please contact me if you wish more info or progressions.