Floor Seated Bottom Up Kettlebell Press - bottom up kettlebells are a great way to increase the challenge of movement without adding load. This is good for swimmers out there with injured/tender shoulders.
Core involved in a wicked shoulder bolstering move!
Palms Up Banded Pull Aparts - warm-up or good for general healthy shoulder movement!
Scapular Pull-Ups - slow and gentle movement through the shoulder girdle. Great for warm-ups and/or general stability
Supine Single Arm KB Shoulder Rotations - activation, pre-hab, rehab and general shoulder bolstering! Slow and controlled.
Strict Toes to Bar - Obviously good for "core", but another sneaky one for working on grip strength! Modify with hanging knee raises, or make harder with a DB between the feet!
Dual KB Overhead Kneeling to Standing. Keep tight and don't wobble! All the muscles involved in this one!