Shoulders can be a confusing body part (ok body parts depending on how you want to define it!) - there’s a lot of different ranges of motion they can move. That’s why it’s so important to condition them and make sure they’re strong to support the multiple ranges of motion your movement discipline requires. For backbending and shoulder flexibility for things like a bridge (aka full wheel), forearm stand, or handstand, a common shoulder position to drill and strengthen is our external shoulder rotation to stabilize our shoulders and allow for a deeper bend in both the shoulders and upper back.