The cuff centres the joint
The rotator cuff does not lift the arm so much as hold the ball in the socket while the deltoid lifts it.
MoPro
Trainer's Eye
The 90/90 position: the angle that throwing, serving and reaching overhead all pass through.
The rotator cuff does not lift the arm so much as hold the ball in the socket while the deltoid lifts it.
Readiness for overhead work is judged on range and strength compared with the other side, not on time passed.
Deltoid pulls the arm up, the cuff pulls it down and in. Lose the second and the first grinds.
Three couplets · two rounds · twelve minutes · a shoulder that reaches
Elbow out at shoulder height; rotate the forearm up against the towel, lower in three.
Easier elbow lower · Harder more tension
Face down, upper arm on the edge, elbow at 90°; rotate the hand up to the ceiling.
Easier no weight · Harder light weight
Stick at the hips; row it to the chest, rotate it up overhead, reverse the path.
Easier no stick, hands only · Harder light bag
Face down; row, rotate the hands up, press overhead, then reverse every step.
Easier no weight · Harder light weights
Arm at shoulder height on the wall; move the blade to twelve, three, six and nine.
Easier smaller range · Harder hold each point
Rotate as far out as the shoulder goes and hold there against light resistance.
Easier less range · Harder longer holds
Each couplet: 60 s scored → the loading set → 10 s to move on. Done at 12:00.