The following is a summary taken from Harvard Health:
Stretching exercises:
Always warm up your shoulder before performing your exercises. The best way to do that is to take a warm shower or bath for 10-15 minutes. In a pinch, you can use a moist heating pad or damp towel heated in the microwave but it may not be as effective. Try the following exercises. Click on the link at the top of the page for details on how to perform them.
The following Is a summary taken from Cedars Sinai:
Best ways to prevent bursitis:
The following is a summary taken from Healthline.com:
Here are some exercises to build the rotator cuff muscles. Not all of these exercises may be right for you. Try out a few and see what works.