My shoulders are disproportionately strong. Over the years I've done just about every kind of shoulder exercise i.e. medicine ball throws, high rep sets, super slow sets, every db, bb and machine variation to handstand pushups, gymnastic holds, ring work, etc. I never had a specific goal other than to push something in some way and do more next time. When I couldn't I tried something else. When I ran out of ideas I went back and tried some of the ones I hadn't done in a while.