Body

muscle

Where it runs

From just below the shoulder socket down the back of the upper arm to the point of the elbow.

What it does

Straightens the elbow, and helps draw the arm down and back.

In a pull-up

Controls the way down, and helps hold the shoulder in the bottom of a hang.

Drills that work it

In the programs

• Phase 2 — Own the top and the way down — Shoulder: kipping works, strict pull-ups do not
• Phase 3 — Strict again — Shoulder: kipping works, strict pull-ups do not

Works alongside

Other structures the same drills work.

• Latissimus dorsi
• Teres major
• Brachialis
• Biceps
• Lower trapezius
• Latissimus and teres major tendons
• Long head of biceps tendon

General anatomy, simplified. It describes a structure, not anybody's shoulder, and cannot say what is wrong with yours.