This workout is a general support for your shoulders and your upper back which is also your shoulder area. Think of this as mobility and light strength training with a constant involvement of your neuromuscular perception of your shoulder joints and upper back.
Do this workout if you have no acute injuries but you need to recover your strength and flexibility in your shoulder area.
When your goal is to develop your shoulder area: Do this workout 3-4 times a week for about 3 months if it feels comfortable to do so.
When your goal is maintenance: Do this workout 1-2 times a week.