Top hold
Jump or step to the top of a pull-up and hold there, elbows bent.
3 × 5–15 s
muscle
Two heads, one from just above the shoulder socket and one from the coracoid, joining at the front of the upper arm and ending on the forearm below the elbow.
Bends the elbow and turns the palm up. The long head also crosses the shoulder joint.
Bends the elbows. It works harder with the palms facing you (a chin-up) than facing away.
Jump or step to the top of a pull-up and hold there, elbows bent.
3 × 5–15 s
Start at the top of a pull-up and lower yourself as slowly as you can to straight arms.
3 × 3–5
A strict pull-up with a band looped under a knee or foot to take some weight.
3 × 3–6
From a still, straight-arm hang, pull until the chin is over the bar, with no swing.
3 × 1–3
Other structures the same drills work.
Print it: the free pull-up muscles diagram labels the biceps →
General anatomy, simplified. It describes a structure, not anybody's shoulder, and cannot say what is wrong with yours.