https://airawear.com/index.php/blog/shoulder-stretches/
I do an odd stretch a friend taught me. You go stand in a doorway and reach back to hold onto the door frame (hands placed with palms outward facing, thumbs up), and lean/hang forward. This stretches your upper arms, shoulders and chest and feels very good, at least to me.
It is similar to the #12 stretch on the site linked above <https: airawear.com="" index.php="" blog="" shoulder-stretches="">and they have a number of other good stretches shown too.</https:>