Did you know that the only part of your entire arm and shoulder attached to the rest of your skeleton is the sternoclavicular joint? ALL of those muscles and movements on such a small joint!
This is why RMT Jonathan Paez digs in under your collar bone. The muscle subclavius can become dysfunctional over time if you consider how much it is used day to day. It’s also a breathing muscle…lots of work for such a little muscle!